1. combine first 3 ingredients-melt butter and mix with dry ingredients-pat into 9 x 9 or 7 x 11 baking pan. 2. peel and slice apples. mix cinnamon and sugar together. mix with apples.spread over crust. 3. Mix streusel topping together and cover the apples. 4. Bake 45-50 min in 350 degree oven.