Eating Blueberry Peach Crisp for dessert is just like eating the most delicious oatmeal cookie you've ever had with the added benefit of warm summer fruit!
Place 4 cups fresh peaches and 2 cups fresh blueberries in a baking dish (10x10" square or 9x11" oval, 9x13" rectangle can also be used). Mix 1/2 cup sugar and 2 tablespoons corn starch together and sprinkle over fruit. Add 1 teaspoon vanilla and juice of half a lemon, stir to combine.
Mix 1 cup rolled oats, 1/3 cup flour, and 1/3 cup brown sugar together in a small bowl. Add 1/2 cup butter, softened, and mix to combine until mixture is crumbly. Spread over fruit mixture.
Bake in preheated oven for 1 hour, until fruit mixture is thick and the topping is golden brown.