Preheat oven to 350ºF. and spray muffin cups with cooking spray. Cream together margarine, sugar, and molasses. Add egg whites and pumpkin. Add dry ingredients and stir until moistened. Add almonds. Fill muffin cups 3/4 full. Combine streusel  topping ingredients, cutting in margarine until mixture is crumbly. Sprinkle streusel topping over muffin batter. Bake for 35-40 minutes until wooden pick comes out clean.