Preheat the oven to 350 degrees F and grease a 9x13 pan.
Mix together the flour, sugar, baking powder, cinnamon, salt, and zest of the lemon.
Forming a well in the dry mixture, add the egg and room temperature butter.
Using your hands or a wooden spoon, mix until all the ingredients are fully incorporated.
In a greased 9x13 pan, flatten half the dough on the bottom of the pan.
After cleaning the blackberries and drying, place in large enough bowl to mix.
Combine the lemon juice, cornstarch, and sugar with the blackberries.
Pour the entire mixture over the bottom half of the dough.
Crumble the remaining dough mixture over the top of the filling.
Bake at 350 degrees F for 45 minutes.
Allow to cool for ~10 minutes and serve warm with ice cream!
0 servings