Wash and remove stems from strawberries. cut in half and place in a 8x8 baking dish. Sprinkle the cornstarch on top and stir to mix. In a seprate bowl mix the flour, sugar, butter, vanilla and baking powder. Spread the flour mixture over the strawberries. Place in a preheated oven for 30 min or untill the topping begins to carmalize. Let cool 10 min before serving.