01 -
Set your oven to 375°F. Use nonstick spray on a 9"x13" pan and cover the bottom with parchment paper.
02 -
Stir together melted butter, flour, cinnamon, baking powder, granulated sugar, and brown sugar. Crack in the eggs and add almond extract, then mix well.
03 -
Keep 1½ cups of the mixture for later. Press the rest firmly into the prepared pan.
04 -
Mix sugar, cornstarch, and lemon juice in a bowl. Then gently fold in blackberries. Spread this evenly on top of the base.
05 -
Crumble the reserved dough over the blackberry layer. Bake it for 40-45 minutes, until it's a nice golden color. Let it cool down completely before cutting.