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1. Preheat oven to 350 degrees and line pans with cupcake liners.
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2. Place an Oreo at the bottom of each liner.
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3. In a large bowl. sift cake mix to remove any lumps.
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4. Add eggs, oil, sour cream, milk and vanilla extract and stir until smooth.
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5. Fill cupcake liners (over the Oreos) 3/4 full and bake for 15-20 minutes or until an inserted knife comes out clean.
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6. Let cool.
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7. Peanut Butter Frosting: Beat butter and peanut butter. Add vanilla extract, 2 tablespoons milk and 1 cup powdered sugar and beat again. Alternate between adding more milk and more powdered sugar until you reach your desired consistency.
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8. Chocolate Frosting: Beat butter and vanilla extract. Add milk, cocoa powder and 1 cup powdered sugar and beat again. Continue to add in more powdered sugar until you reach your desired consistency. If it becomes too thick, add more milk.
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9. To achieve the "swirl" effect, follow photo directions beneath.
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10. Pipe onto cooled cupcakes and top with extra Peanut Butter Oreos.