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1. Preheat oven to 350 degrees and line pans with cupcake liners.
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2. Place your Oreo halves cream side up on the bottom of each liner. (Feel free to eat the non-cream side as you bake.)
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3. Sift cake mix into a small bowl and set aside.
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4. In a large bowl, use a whisk to combine eggs, oil, milk, sour cream and vanilla extract.
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5. Add cake mix and stir until smooth.
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6. Fill cupcake liners (over oreo halves) 3/4 full and bake for 17-22 minutes, or until an inserted knife comes out clean.
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7. Cookie Dough Filling: Combine all ingredients in a stand mixer, except chocolate chips, and beat until smooth. Then fold in chocolate chips. Add more flour if needed to thicken.
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8. Use a knife to cut out small holes of each cupcake and fill with cookie dough filling. You can do this while the cupcakes are still warm.
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9. Frosting: Beat butter for 2 minutes. Add cocoa, vanilla extract and milk. Scrape down the bowl as needed. Slowly add powdered sugar until you reach your desired consistency. Add a little more milk if the frosting becomes too thick. Fold in brownie crumbles.
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10. Pipe frosting onto cupcakes over the cookie filling and top with sprinkles, mini chocolate chips or Oreos.
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11. Taste bud party!