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reheat the oven.
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Spray an 8-inch springform pan with vegetable cooking spray and set aside.
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To prepare topping,in a small bowl, combine dry ingredients.
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Using a pastry blender or 2 knives, cut in margarine until coarse crumbs form. Set aside.
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To prepare cake, in a medium bowl, combine the dry ingredients. Mix well.
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In a large bowl, whisk egg whites, sour cream, milk, and oil.
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Add flour mixture; stir until just combined.
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Spoon batter into prepared pan.
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Sprinkle topping over batter.
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Bake until a toothpick inserted in center comes out clean, about 40 minutes.
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Place pan on a wire rack; cool for 10 minutes.
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Remove side of pan; cool cake completely.
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NOTES: Fruit toppings give coffee cakes extra flair.
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After spooning batter into the pan, try arranging thin slices of apple over the top, then proceed as directed.