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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 large bowl and add eggs, oil, sour creme, buttermilk and vanilla extract and stir until smooth.
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3. Fill cupcake liners 3/4 full and bake for 14-17 minutes or until an inserted knife comes out clean.
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4. Let cool.
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5. Beat butter and cream cheese until smooth. Add 2 cups powdered sugar and 1 tablespoon milk. The continue to add in more powdered sugar until you reach your desired consistency. Add more milk if it becomes too thick and add food coloring.
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6. To Make Eyes: (see photos) Melt white chocolate melts, pour into a small bag to make a mini piping bag, pipe dime-sized circles onto wax paper then immediately place a brown M&M on top and let set for a few minutes.
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7. Pipe green frosting onto cupcakes (see photos) and shape the frosting into Frank's head. You can make it as square-shaped as you like! Place a Reese's Cup on top, put eyes on and then chocolate chips as"bolts" and use the Jimmies to give eyebrows and a mouth!