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1. Preheat oven to 350 degrees and line pans with parchment paper.
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2. Sift cake mix into a large bowl to remove lumps.
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3. Add eggs, oil and brown sugar and stir until smooth. Batter will be thick.
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4. Scoop walnut sized dough balls onto cookie sheets and gently press them down to make them a little flatter. (Cake mix cookies can sometimes bake up tall and not spread out like normal cookies.)
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5. Bake for 6-8 minutes depending on how fudgey you want them to be.
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6. Let cool.
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7. Peanut Butter Frosting: Beat butter and peanut butter together. Add vanilla extract and 2 Tablespoons milk. Slowly add in powdered sugar until you reach your desired consistency. Add more milk if it becomes too thick.
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8. Peanut Butter Chocolate Ganache: Place chocolate chips and peanut butter in a microwave proof bowl and heat in the microwave (about 1 minute). Stir until smooth.
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9. To assemble: Frost cookies. I used a large circle tip in a piping bag to pipe out a little circle and then I used a spoon to flatten the frosting out and create a sort of "well" to hold the ganache. Put a spoonful of ganache on each frosting cookie and then top with chopped peanut butter cups!