Instructions: Combine flour, baking powder, baking soda and salt in a bowl and mix well. In a separate bowl, combine butter and sugar and beat with hand mixer, add egg, vanilla and yogurt and mix well. Slowly add flour mixture to batter and mix well. Spray a 9-inch pan with non-stick cooking spray and pour batter into pan. Arrange apples over batter. Combine topping ingredients and mix until a crumb mixture forms. Sprinkle over apples and bake at 350 degrees for about 30 minutes.

Chefs Notes: Use your favorite egg and sugar substitute.

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