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Preheat oven to 350 degrees.
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Line 2 muffin tins with 24 cupcake liners.
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Mix the cake mix with the rest of the cake ingredients until nice and smooth.
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Fill liners 3/4 way full with batter. Use large cookie scoop to make this easier.
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Bake for 15-20 minutes or until a knife inserted comes out clean.
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Let cupcakes cool completely on a wire rack.
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To make the frosting, combine butter and peanut butter and beat until smooth.
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Add the powdered sugar one cup at a time and beat until incorporated.
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Add in the vanilla and cream and beat on medium high speed until light and fluffy...about 3 minutes.
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Place frosting in a pastry bag and pipe onto the top of the cupcakes.
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Top with a mini Reese's peanut butter cup and gold sprinkles, if desired.