"Boozy cupcakes are way better than non-boozy cupcakes...."
INGREDIENTS
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1 box vanilla cake mix
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1/2 c. vegetable oil
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3 eggs
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1 1/3 c. Rumchata, divided
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1 c. (2 sticks) butter, softened
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4 c. powdered sugar, divided
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1 tsp. pure vanilla extract
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1/4 tsp. cinnamon, plus more for garnish
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kosher salt