Easy Blackberry Crumble Cake - cooking recipe

Ingredients

1 cup blackberries
1/4 cup white sugar
1/3 cup quick-cooking oats
1/4 cup brown sugar
1 1/2 teaspoons ground cinnamon
1 cup all-purpose flour
3/4 cup white sugar
1 teaspoon salt
1 teaspoon baking powder
1/4 cup milk, or as needed
1/4 cup butter, cut into small chunks

Preparation

Preheat oven to 350 degrees F (175 degrees C). Butter a 9x12-inch baking dish.
Stir blackberries and 1/4 cup white sugar together in a bowl.
Mix oats, brown sugar, and cinnamon together in a separate bowl.
Mix flour, 3/4 cup white sugar, salt, and baking powder together in a third bowl. Add milk to flour mixture; mix well. Pour batter into prepared baking dish. Top with blackberry mixture; sprinkle oat mixture over blackberries. Top oat mixture with butter chunks.
Bake in the preheated oven until bubbling, about 30 minutes.