Ingredients
2 Granny Smith apples
1 pint or so blueberries
2/3 cup flour
1/3 cup packed light brown sugar
1/3 butter
Cinnamon
Preparation
Preheat oven to 375
Line bottom of 8x8 baking pan with peeled and thinly sliced apples. Sprinkle with lemon juice. Arrange blueberries atop apples. In small bowl, cut together flour, sugar, and butter (like for apple pie topping). Sprinkle crumble topping on blueberries. Dust the topping with cinnamon.
You could consider dusting the apple layer with some cinnamon sugar before adding the blueberries for some extra sweetness.
Bake (covered loosely with aluminum foil) for about 30 minutes, until topping is browning and berry juice is bubbling.