INGREDIENTS
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1 package yellow cake mix (mix only, not prepared)
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1 egg
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1 cup sour cream (may sub plain greek yogurt)
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¼ cup butter, melted
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1 teaspoon vanilla
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crumble topping
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1¼ cups flour
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⅔ cup brown sugar
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½ cup sugar
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½ teaspoon salt
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1 teaspoon cinnamon
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½ cup butter (8 tablespoons), chilled and cut into cubes