"Cinnamon Streusel Coffee Cake - A light & fluffy golden cake topped with a classic cinnamon, brown sugar streusel topping...."
INGREDIENTS
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1 box yellow cake mix (+ ingredients on back of box)
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1 cup cold salted butter
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2 1/4 cup flour
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1 tablespoon cinnamon
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1 3/4 cup brown sugar
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1 1/2 tablespoons vanilla
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optional powdered sugar (dusting)