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Heat oven to 350°F.
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Spray a 9-inch round cake pan with non stick cooking spray, dust with flour.
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In a small bowl, combine egg whites and 1/2 tsp baking powder; beat until stiff peaks form; set aside.
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Lightly spoon flour into measuring cup and level off.
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In a large bowl, combine flour and remaining cake ingredients.
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Beat at low speed until moistened, beat for 2 minutes at medium speed.
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Gently fold in egg whites into batter.
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Pour into prepared pan.
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Bake at 350°F for 27 to 35 minutes or until toothpick inserted in the center comes out clean.
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In a small bowl, combine topping ingredients; spread over hot cake.
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Cool cake completely in the pan on a wire rack.