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1. Preheat oven to 350 degrees and line pans with cupcake liners.
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2. Sift cake mix into a small bowl and set aside (I like to use Pillsbury).
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3. Combine eggs, oil, milk, sour cream, and vanilla extract until smooth.
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4. Add cake mix and stir well.
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5. Fill cupcake liners 3/4 full and bake for 15-20 minutes or until an inserted knife comes out clean.
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5. Frosting: Beat butter and cream cheese for 2 minutes. Add vanilla extract and slowly add powdered sugar until you reach your desired consistency. Add milk to thin out if needed.
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6. Pipe frosting onto cooled cupcakes and top with a mustache!