"An easy classic cinnamon sheet cake that starts with a cake mix...."
INGREDIENTS
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Duncan Hines Classic Yellow Cake Mix
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3 large eggs
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1 cup buttermilk (you can use regular milk)
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1/3 cup vegetable oil
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cinnamon sugar
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1/2 cup granulated sugar
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2 tsp cinnamon
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4 Tbsp cold (or frozen) unsalted butter