INGREDIENTS
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cooking spray
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1 tablespoon flour, or as needed
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Cake:
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1/4 cup butter, softened
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3/4 cup brown sugar
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1 large egg
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1/4 cup sour cream
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1/4 cup vanilla yogurt
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1 teaspoon vanilla extract
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1 cup all-purpose flour
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3/4 teaspoon ground cinnamon
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1/2 teaspoon baking soda
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1/4 teaspoon salt
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2 cups diced Granny Smith apple
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Topping:
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1/4 cup brown sugar
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1/4 cup all-purpose flour
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2 tablespoons butter
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1/2 teaspoon ground cinnamon
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