This lemon poppy seed sheet cake skips the glaze and goes straight to cream cheese frosting. It stays soft and full-flavored with real lemon that doesn’t fade into the background.
Lemon Poppy Seed Sheet Cake with Lemon Cream Cheese Frosting (9×13)
Lemon poppy seed sheet cake with lemon cream cheese frosting. I’ve been making it this way for years. It’s fully frosted and stays soft, definitely dessert, not a brunch loaf.
Lemon poppy seed cake was everywhere in the 90s. It was always some lemon-glazed or icing-drizzled treat that seemed to come out of nowhere. I grew up eating elaborate, yeasted, poppy seed roll desserts, so everyone suddenly treating poppy seeds like something new was interesting to me. It was suddenly in muffins and loaves and coffee shop cases all at once. It was really the lemon flavor with the poppy seeds that got people. My favorite pairing is still poppy seeds with almond paste, but that’s a different conversation entirely.
It was Ruth’s ninety-fourth birthday and I wanted to make something for her.
She lived next door to me, crocheting blankets for my son before he was even born, always doing something for me without making a thing out of it. I asked her what kind of cake she wanted and without hesitation she said anything lemon poppy seed.
And then I thought about her pantry. Ruth kept a stockpile of canned frosting in there and would eat it with a spoon, right out of the container, the ones with the plastic snap-on lids. This is the woman who taught me how to make homemade ricotta cheese but she couldn’t be bothered with making frosting from scratch even though she loved it. She told me two spoonfuls was her night dessert. What a diva.
So when I started thinking about her birthday cake, glaze didn’t make sense for her, because she was a frosting-eating icon. I went straight to lemon cream cheese frosting and made it into a sheet cake. It was going to look better with candles anyway.
I packed up lunch and took her to the tables above the beach in our neighborhood, the ones she could still walk to, and we sat there with the water right in front of us and the cake in the middle of the table. The wind wouldn’t let us light a candle, but it didn’t matter anyway. Ruth devoured her frosted, not glazed, birthday cake.
This is the one I made for her, and the one I still make. It stays soft from the oil, and I work the lemon into the sugar so the flavor is there from the start. The cream cheese frosting turns it into a real dessert instead of something you brush with glaze and have with your morning coffee.
What Makes This Cake Different
- I use oil instead of butter because I’ve made it both ways and I don’t like what butter does to it later, especially once it’s been in the fridge with cream cheese frosting. Oil keeps it soft, even after it’s been in the fridge, which is what I want.
- When I start with the lemon, I take the zest and rub it into the sugar with my fingers. This creates a more pronounced lemon flavor, not surface-level lemon. I’ve tried stirring it straight into the batter and it’s not the same.
- The cream cheese frosting started as a specific choice for someone, but it’s what makes this feel special instead of something finished with glaze.
- I make it in a 9×13 because this isn’t a snack, it’s dessert.
Ingredients
- All-purpose flour – this keeps the cake from turning dense while still holding together.
- Poppy seeds – you see them right away and get that slight texture, but they’re not what you taste first.
- Lemon (zest and juice) – I use both, but at different points. The zest gets rubbed into the sugar first, and the juice comes in later to keep the flavor from going dull. Both are also used in the cream cheese frosting.
- Granulated sugar – this is where the lemon starts, I work the zest into it first.
- Neutral oil – this keeps the cake soft even after it’s been in the fridge with the frosting on it.
- Eggs – room temperature so everything mixes evenly.
- Whole milk – this loosens the batter once it starts getting thick so it mixes smoothly.
- Butter – softened so the frosting blends evenly.
- Cream cheese – gives the frosting that slight tang so it doesn’t turn overly sweet.
- Confectioners’ sugar – added in stages, that’s where the sweetness comes from.
How to Make Lemon Poppy Seed Cake
Find the complete printable recipe with measurements in the recipe card at the BOTTOM OF THE POST.
- Step One (prep the pan and dry mix)
Heat the oven to 350°F and spray a 9×13-inch baking dish. In a bowl, mix the flour, poppy seeds, baking powder, baking soda, and salt so everything is evenly combined before it goes into the batter. - Step Two (make the lemon base)
In a larger bowl, rub the lemon zest into the sugar with your fingers until it smells stronger and the sugar feels slightly damp. That’s where the lemon starts, not at the end. Add the oil and mix, then add the eggs one at a time, mixing after each so the batter stays smooth. Stir in the extract and lemon juice. - Step Three (bring the batter together)
Add the dry ingredients in a couple rounds, and once it starts getting thick, pour in the milk and keep mixing until the batter is smooth. The batter should be thick but still pourable so it settles into the pan without needing to be pushed around. - Step Four (bake and cool)
Pour the batter into the pan and spread it evenly, then bake for about 35 minutes, until a toothpick inserted in the center comes out clean. Let it cool completely before frosting or the top won’t hold and the frosting won’t stay where you put it. - Step Five (make the frosting and finish)
Beat the butter and cream cheese until smooth, then add the lemon zest, lemon juice, and some of the confectioners’ sugar to start it, then add the rest until it’s thick enough to spread without sliding. Spread it over the cooled cake and finish with extra lemon zest or poppy seeds if you want that.
Recipe Tips
- Stop mixing once the flour disappears into the batter. It can look fine and still be overmixed at that point.
- There’s a point where the batter gets thick and looks like it went wrong. That’s usually where people start adding extra liquid they don’t need.
- After the milk goes in, keep mixing until it smooths out. It always looks a little off right before it smoothes out.
- Don’t leave it in the oven longer to be safe. That’s where it starts to dry out.
- If you frost it while it’s still warm, you’ll see it right away. The frosting won’t stay where you put it.
- It’s better once it’s had a little time for the texture to even out than right out of the oven.
- If you want to go further with it, this is really good with a scoop of lemon poppy seed ice cream on the side.
Storage
- It goes in the fridge because of the cream cheese frosting. It still tastes right straight from cold, which isn’t always the case, and that’s why I used oil instead of butter.
- You don’t want this sitting out all day. It’s fine while you’re serving it, then it goes back in the fridge.
- If you’re making it ahead, the next day is better. Everything has had time to take on flavor.
- If you’re freezing it, my suggestion is to do it without the frosting and add that after it’s thawed.
FAQs
- Can I make this cake ahead of time?
Yes. I usually do. It’s better the next day after it’s been in the fridge. - Can I use bottled lemon juice?
Technically yes, but logistically it doesn’t make sense. This cake relies on the zest more than anything, that’s where the lemon aroma and flavor come from in both the cake and the frosting. And if you’re using the zest, you already have the lemon, so you have the juice too. Bottled juice will never give you that, and you can’t do the sugar step without the zest, so it doesn’t make sense for this cake. - Do I have to use the frosting or can I glaze it?
You can glaze it, but then you’re making a different cake. This one was always meant to have the cream cheese frosting. It’s part of it, not something added at the end. - Why do you rub the lemon into the sugar first?
Because that’s where the flavor really starts. When you take the time to do that, it changes how the lemon comes through in the cake. If you skip it and add everything later, it never quite gets there. - Why use oil instead of butter?
I’ve made it with butter and didn’t like what happened after it had been in the fridge with the frosting. This keeps the texture the same the next day, which matters with a cake like this. If this cake didn’t require refrigeration because of the frosting, butter could work.
From My Kitchen Notes
Just a few observations.
- There are moments where I can feel myself about to overdo something in the kitchen, and I don’t always stop, not because I don’t know better, but because I want to see what happens if I cross that line anyway.
- I’ve noticed that when I start second-guessing something, it’s rarely because something is wrong and more because I’m not used to letting it be that direct.
- Some things don’t need to be adjusted. I know it and still stand there like I might.
- I still think about the way Ruth would eat frosting out of a can and how she never felt the need to justify that to anyone. Good for her.
- There’s a choice that closes off other options immediately, and I’ve started following that instinct more than leaving everything open.
- There are things I don’t explain because the second I do, they start to feel less true.
- There are times where I know exactly what I’m doing and moments where I’m following something I don’t fully understand yet, and I no longer treat those the same way anymore. I’m not sure when that changed.
- There’s a difference between something that asks you to come closer and something that keeps you at a distance. I don’t ignore that anymore.
- Not everyone grew up around poppy seeds, and those who didn’t treated them like decoration instead of something they knew how to handle.
- You don’t not commemorate a ninety-fourth birthday. That would be crazy.
- Ruth was the most put-together, wealthy, little woman who still gardened, went for walks, dressed up, and stayed social while she enjoyed life in her little beach house. Loved her.
- There’s a point where the sugar changes when you rub the zest into it and you only notice it if you’ve done it enough times to know what it felt like before.
- There are cakes that change once they go in the fridge and cakes that don’t.
- You can tell when something was decided halfway through.
- Some things only make sense once everything is together. And then you see it.
- I don’t think everyone notices when something stays consistent from the first bite to the last. That doesn’t just happen. It’s crafted.
- There are moments where everything is right in front of you, and you still act naïve. That’s a choice.
More Frosted Dessert Cakes
- Strawberry Poke Cake – fresh strawberries, whipped cream cheese.
- Old-Fashioned Chocolate Cake – rich crumb, glossy icing.
- Brown Butter Carrot Bundt Cake – nutty, spiced, cream cheese.
- Chocolate Zucchini Cake – deep chocolate, orange cream cheese.
- Banana Sheet Cake – soft crumb, tangy frosting.
- Lemon Raspberry Frosted Sheet Cake – tart berries, fully frosted.
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Lemon Poppy Seed Cake with Cream Cheese Frosting
A soft, sliceable lemon poppy seed sheet cake made with oil for lasting moisture and finished with a tangy lemon cream cheese frosting.
Servings: 12
Calories: 420kcal
Equipment
- baking dish 9x13 (23x33 cm). For even baking and easy slicing.
- 2 mixing bowls One for dry ingredients, one for wet.
- hand mixer or stand mixer. For smooth batter and frosting.
- microplane grater or fine grater. For zesting lemon without bitterness.
- rubber spatula For folding and scraping batter evenly.
Ingredients
Lemon Poppy Seed Cake:
- 2½ cups (300 g) all-purpose flour spooned and leveled
- 1 tbsp (9 g) poppy seeds
- 2 tsps (8 g) baking powder
- ½ tsp (3 g) baking soda
- ½ tsp (3 g) table salt
- 2 tsps (4 g) lemon zest
- 1½ cups (300 g) granulated sugar
- ¾ cup (180 ml) neutral oil (canola, vegetable or light olive oil)
- 3 large eggs room temperature
- 1 tsp (5 ml) vanilla extract or lemon extract
- 2 tbsps (30 ml) fresh lemon juice
- ½ cup (120 ml) whole milk
Lemon Cream Cheese Frosting:
- ½ cup (115 g) butter softened
- 8 oz (225 g) cream cheese softened
- 2 tsps (4 g) lemon zest
- 2 tbsps (30 ml) lemon juice
- 4 cups (460 g) confectioners' sugar
Garnish:
- Additional lemon zest, lemon slices and poppy seeds (optional)
Instructions
- Heat oven to 350°F (175°C). Spray a 9×13-inch (23×33 cm) baking dish with nonstick cooking spray and set aside.cooking spray
- In a medium bowl, whisk together flour, poppy seeds, baking powder, baking soda, and salt until evenly combined.2½ cups (300 g) all-purpose flour, 1 tbsp (9 g) poppy seeds, 2 tsps (8 g) baking powder, ½ tsp (3 g) baking soda, ½ tsp (3 g) table salt
- In a large bowl, combine lemon zest and sugar. Rub together with your fingers until fragrant and slightly damp. This step pulls the oils from the zest into the sugar for stronger lemon flavor.2 tsps (4 g) lemon zest, 1½ cups (300 g) granulated sugar
- Add oil to the lemon sugar and beat with an electric mixer until fully combined. Add eggs one at a time, mixing well after each addition.¾ cup (180 ml) neutral oil, 3 large eggs
- Mix in the extract and lemon juice until smooth.1 tsp (5 ml) vanilla extract, 2 tbsps (30 ml) fresh lemon juice
- Add the dry ingredients in batches. When the batter becomes thick, add the milk and continue mixing until smooth. The finished batter will be thick but pourable.½ cup (120 ml) whole milk
- Pour batter into the prepared pan and spread evenly.
- Bake for 35 minutes, or until a toothpick inserted in the center comes out clean. Cool completely before frosting.
- To make the frosting, beat butter and cream cheese until completely smooth. Add lemon zest, lemon juice, and 1 cup (115 grams) confectioners' sugar. Mix until combined, then continue adding confectioners' sugar in stages until the frosting is thick and spreadable.½ cup (115 g) butter, 8 oz (225 g) cream cheese, 2 tsps (4 g) lemon zest, 2 tbsps (30 ml) lemon juice, 4 cups (460 g) confectioners' sugar
- Spread frosting evenly over the cooled cake. Finish with additional lemon zest, lemon slices or poppy seeds if desired.Additional lemon zest, lemon slices and poppy seeds
Notes
- Room temperature ingredients help the batter emulsify evenly and prevent a dense texture.
- Rubbing zest into sugar distributes lemon flavor throughout the cake instead of concentrating it in pockets.
- Oil keeps the cake soft even after refrigeration, unlike butter-based cakes which firm up more when chilled.
- For stronger lemon flavor, add ½ teaspoon (2.5 ml) lemon extract to the frosting.
Nutrition
Nutrition Facts
Lemon Poppy Seed Cake with Cream Cheese Frosting
Amount Per Serving (140 g)
Calories 420
Calories from Fat 198
% Daily Value*
Fat 22g34%
Saturated Fat 8g50%
Polyunsaturated Fat 5g
Monounsaturated Fat 7g
Cholesterol 70mg23%
Sodium 210mg9%
Potassium 110mg3%
Carbohydrates 52g17%
Fiber 1g4%
Sugar 36g40%
Protein 5g10%
Vitamin A 350IU7%
Vitamin C 4mg5%
Calcium 70mg7%
Iron 2mg11%
* Percent Daily Values are based on a 2000 calorie diet.
Have you made this Lemon Poppy Seed Cake with Lemon Cream Cheese Frosting? I’d love to hear how it turned out – leave a comment below and let me know.
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