Old-Fashioned Blueberry Crisp with Oat Topping

This old-fashioned blueberry crisp is packed with juicy blueberries and topped with a buttery oat crumble that bakes up golden and crisp. Made with simple ingredients like lemon zest, brown sugar, and chopped walnuts, it’s the kind of dessert that practically begs for a scoop of vanilla ice cream.

Course Dessert

Cuisine American

Keyword Blueberry Crisp, blueberry crisp recipe with walnuts, blueberry crisp with lemon zest, blueberry crisp with oats, blueberry oat crisp, easy blueberry crisp, homemade blueberry crisp

Prep Time 15

Cook Time 30

Chilling 30

Total Time 1 15

Servings crisps

Calories 454kcal

Author Cathy Pollak

Equipment

measuring cups and spoons For accuracy.
2 mixing bowls One for the topping, one for the filling.
4 fluted crème brulee ramekins (240 ml/ 8oz) or see instructions below how to make in an 8x8 pan.

Ingredients

Oat Topping:

6 tbsps. (75 g) granulated sugar
6 tbsps. (47 g) all-purpose flour
¼ cup (20 g) old-fashioned rolled oats
¼ cup (55 g) packed light brown sugar
¼ cup (30 g) chopped walnuts
1 tsp. (about 2 g) lemon zest
¼ tsp. (1.25 ml) vanilla extract
¼ tsp. kosher salt
¼ tsp. (0.6 g) ground cinnamon
4 tbsps. (57 g) unsalted butter room temp

Blueberry Crisp Filling:

½ cup (100 g) granulated sugar
¼ tsp. (1.5 g) kosher salt
2 tsps. (10 ml) fresh lemon juice
½ tsp. (2.5 ml) vanilla extract
4 cups (570 g) fresh blueberries
2 tbsps. (15 g) cornstarch
2 tsps. (10 ml) brandy or water
vanilla ice cream (optional) for serving

Instructions

Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper and set aside.
In a medium bowl, combine all of the oat topping ingredients. Use your fingers to work in the butter until the mixture is crumbly. Transfer to the freezer to chill for 30 minutes.
6 tbsps. (75 g) granulated sugar, 6 tbsps. (47 g) all-purpose flour, ¼ cup (20 g) old-fashioned rolled oats, ¼ cup (55 g) packed light brown sugar, ¼ cup (30 g) chopped walnuts, 1 tsp. (about 2 g) lemon zest, ¼ tsp. (1.25 ml) vanilla extract, ¼ tsp. kosher salt, ¼ tsp. (0.6 g) ground cinnamon, 4 tbsps. (57 g) unsalted butter
In a large bowl, combine all of the filling ingredients and mix until the berries are evenly coated.
½ cup (100 g) granulated sugar, ¼ tsp. (1.5 g) kosher salt, 2 tsps. (10 ml) fresh lemon juice, ½ tsp. (2.5 ml) vanilla extract, 4 cups (570 g) fresh blueberries, 2 tbsps. (15 g) cornstarch, 2 tsps. (10 ml) brandy
Place 4 (8 oz./240 mL) fluted ceramic ramekins on the prepared baking sheet. Divide the berry mixture evenly between them.
Spoon the chilled topping over each ramekin, gently mounding it on top.
Bake for about 30 minutes, or until the berries are bubbly and the topping is browned.
Serve warm or at room temperature with vanilla ice cream.
vanilla ice cream

Video

Notes

Frozen blueberries can be used—do not thaw fully. Add 1 extra teaspoon (5 g) of cornstarch to thicken the filling.
For a single-pan version, use a 1.5-quart (1.4-liter) baking dish. For an 8x8-inch (2-quart) pan, increase the blueberries to 6 cups (855 g) and increase the oat topping ingredients by 50%.
The oat topping can be made ahead and frozen. Store in a sealed container or freezer bag until ready to use.
The filling can be prepared a few hours ahead but should be assembled just before baking to avoid excess liquid.
To freeze before baking, assemble the crisp and cover tightly. Bake from frozen, adding extra time until bubbly and golden.
To freeze after baking, cool completely, wrap tightly, and freeze for up to 3 months. Thaw overnight in the refrigerator before reheating.
The nutrition values listed are for the blueberry crisp only and do not include vanilla ice cream.
Standard nutrient data used for conversion. No absorption adjustments were necessary.

For the best results when making this old-fashioned blueberry crisp, check out the full post. It includes extra notes, tips, and frequently asked questions that aren't listed in the recipe card — like how to make it dairy-free, gluten-free, or ideas for simple ingredient swaps.

Nutrition information is an estimate and will vary based on the brands and products you use.

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