This calls for strawberries and raspberries, but we made it with strawberries and blueberries and really liked that as well.
Filling1 Tb cornstarch
1/3 cup sugar
2 cups fresh or frozen raspberries
1 cup fresh or frozen strawberries
1 Tb lemon juice
Topping1 1/2 cups flour
1/3 cup sugar
1/2 tsp baking soda
3/8 tsp salt
1/3 cup butter
1/3 cup milk
Blend the sugar and cornstarch. Add fruit and lemon juice and stir until combined. Put filling in a square baking dish and set aside.
For topping, whisk together the dry ingredients. Work in butter just until the mixture is evenly crumbly. Add the milk and stir until everything is moistened.
Use a teaspoon scoop to drop balls of dough close together on top of the filling. Sprinkle with sugar if desired.
Bake at 375 degrees for 25-30 minutes, until the top is browned and filling is bubbly. Allow dish to cool for at least 15 minutes before serving.