01 -
Set your oven to 375°F. Spray a 9x13 pan with some nonstick spray, then place parchment paper on the bottom.
02 -
Stir together butter, flour, baking powder, cinnamon, and both kinds of sugar. Toss in the eggs and almond extract, then mix everything well.
03 -
Take 1½ cups of the mixture and leave it for the topping. Press the remaining dough into the pan you prepared earlier.
04 -
Mix the sugar, cornstarch, and lemon juice in a bowl. Gently mix in the blackberries, then spread it evenly over the base.
05 -
Crumble the reserved dough over the blackberries. Bake for 40–45 minutes until golden. Let it cool completely before cutting.