Preheat the oven to 350F and grease a casserole dish with butter or ghee. Mine is a weird "flag" size of 10 x 6, whatever you have as close to that will work like a square 8 or 10-inch pan.
Mix berries with sugar and starch then place them in the bottom of the pan.
Mix all of the topping ingredients. Once the topping ingredients are well combined. Spread the topping over the top of the apples.
Bake at 350F for 30-35 minutes then broil for 1-2 minutes or until the topping is golden brown. DO NOT OVERBOIL OR IT WILL BURN! Watch it like a hawk when it's under the broiler! DO NOT WALK AWAY