Preheat oven to 375 degrees F.
Mix together fruit, 1 T. brown sugar, and cornstarch or almond flour if using (make sure you thaw fruit if using frozen).
Pour fruit into greased 8x8 inch pan.
Add all topping ingredients to food processor and pulse until mixed.
Cut butter into 8-10 pieces and put on top of mixture in food processor.
Pulse until mix clumps together and not powdery.
Empty topping evenly on top of fruit (break up any large clumps).
Bake for 40-45 minutes or until fruit is bubbly and topping is browned.