"Buttery cinnamon crumb topping is the crowning glory to this flavorful cake that starts with a simple cake mix. Photo credit: Christi Johnstone from Love From The Oven..."
INGREDIENTS
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1/2 cup flour
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1/2 cup firmly packed brown sugar
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4 teaspoons McCormick® Cinnamon, Ground
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1/2 cup (1 stick) butter, melted
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1 cup chopped walnuts
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1 package (2-layer size) white cake mix
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1 egg
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1 cup sour cream
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1/4 cup (1/2 stick) butter, melted
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1 teaspoon McCormick® Pure Vanilla Extract