1. Preheat oven to 350 degrees and line cookie sheets with parchment paper.

2. In a large bowl, combine cake mix, eggs, oil and brown sugar until smooth.

3. Make small dough balls about the size of a walnut and place on cookie sheets 3 inches apart.

4. Bake for 6-8 minutes depending on how brownie-like or cake-like you want them to be.

5. Let cookies cool.

6. Chocolate Filling: Combine all ingredients until smooth in a standing mixer. Add more powdered sugar if too thin or not sweet enough.

7. Frost the bottoms of half the cookies and place the unfrosted cookies on top to create little Oreo cookie "sandwiches."

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.