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1. Preheat oven to 350 degrees and line cookie sheets with parchment paper.
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2. In a large bowl, combine cake mix, eggs, oil and brown sugar until smooth.
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3. Make small dough balls about the size of a walnut and place on cookie sheets 3 inches apart.
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4. Bake for 6-8 minutes depending on how brownie-like or cake-like you want them to be.
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5. Let cookies cool.
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6. Chocolate Filling: Combine all ingredients until smooth in a standing mixer. Add more powdered sugar if too thin or not sweet enough.
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7. Frost the bottoms of half the cookies and place the unfrosted cookies on top to create little Oreo cookie "sandwiches."
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8. Place in tupperware and refrigerate for at least 20 minutes. Chilling them helps the filling not to gush out when you eat them BUT it's not necessary.