Ingredients
Method
- Preheat oven to 350°F (175°C). Make crumb: mix 1 cup flour, brown sugar, and cinnamon. Cut in cold butter until clumpy; set aside.
- Whisk remaining 1 1/2 cups flour, baking powder, baking soda, and salt.
- Cream 1/2 cup softened butter and granulated sugar until fluffy, about 3 minutes. Beat in eggs one at a time, then vanilla.
- Add dry mix and buttermilk alternately, beginning and ending with flour, mixing just until combined.
- Fold in blueberries. Spread batter in a greased 9-inch square pan, top evenly with crumb, pressing lightly.
- Bake 45-50 minutes until golden and a toothpick has moist crumbs. Cool 10 minutes before slicing.
Notes
If using frozen blueberries, add them without thawing. The cake keeps at room temperature for a day or refrigerated for up to four days. Reheat squares in a toaster oven at 300°F for a few minutes to bring back the crunch.
