I tried this recipe tonight and it was delicious. I had raspberries in the freezer from last summer so I pulled them out this morning to thaw them out.
Combine 1/2 cup sugar, 1/2 cup brown sugar, 3 Tbsp. tapioca, and 4 cups of berries in a large pot. Cook over medium heat until thick, about 10-15 minutes.
Pour into a 9 x 13 inch cake pan. In a bowl mix together 1 cup flour, 1/2 cup sugar, 1 1/2 tsp. baking powder, 1/2 tsp. salt, 1/4 cup melted butter, and 1/2 cup milk.
Drop batter by spoonfuls over berries.
Bake at 375 degrees for 45 minutes. The topping looks a little dark here but it actually turned out perfect. The house smelled wonderful!