Preheat the oven to 350 degrees F. Grease a 9x13 baking pan and line with a sheet of parchment paper that hangs over the sides. (This will keep any residual blueberry juices from sticking to the pan.)
Coat fresh blueberries with 1 tablespoon of flour and set aside.
1-1/2 cups fresh blueberries
In a large mixing bowl, thoroughly combine all dry ingredients. Set aside.
2-3/4 cups all-purpose flour, 2 tsp. baking powder, 1/2 tsp. baking soda, 1/2 tsp. table salt
In a medium sized bowl, beat softened butter and sugar until light and creamy. Add the eggs, vanilla and buttermilk. Mix on low until just combined.
3/4 cup unsalted butter, softened, 1-1/2 cups granulated sugar, 4 large eggs, 2/3 cup buttermilk, 2 tsps. vanilla extract
Slowly add your dry ingredients to the wet ingredients, with your mixer on low speed. Stir in lemon zest and juice. Gently fold in the flour coated blueberries.
2 tbsps. lemon zest, 1/4 cup fresh lemon juice
Pour your batter into the prepared baking pan. Bake for 30-40 minutes or until a toothpick inserted into the center of the cake comes out clean.
Allow cake to completely cool before applying the glaze.