1. Line a square baking pan with aluminum foil, allowing 6 inches of foil to extend over two opposite sides of pan. Coat foil with cooking spray and set aside.
2. Cream together 2 tablespoons margarine and sugar at medium speed of an electric mixer until light and fluffy, about 5 minutes. Add egg whites; beat for 2 minutes at medium speed, or until well blended. Add milk, applesauce, and vanilla; mix well.
3. Combine 1-1/3 cups flour, baking powder, and salt in a bowl. add to creamed mixture, stirring just until moistened. Spread into the prepared pan; arrange apple slices in a single layer in 3 rows, core side down, on top of batter, pressing gently into batter.
4. Combine 3 tablespoons flour, brown sugar, and cinnamon; stir well. Add melted margarine, and toss well; sprinkle over apples. Bake at 350 degrees for 45 minutes or until browned; cool completely in the pan.

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