Almost like ice cream sandwiches, but without the ice cream headache! Chocolate and vanilla are always an incredible combination, especially when it's Duncan Hines Chocolate Decadence Brownie Mix.
- Preheat oven to 375 ºF. Grease cookie sheet.
- Combine brownie mix, egg, water and oil in large bowl. Stir until well blended and soft dough forms. Drop by level measuring tablespoons about 2 inches apart onto greased cookie sheet.
- Bake at 375 ºF. for 7 to 8 minutes or until cookies are set in center. Do not over bake. Cool for 1 minute before removing to cooling rack. Cool completely before assembling.
- Spread frosting on half the cookies. Top each frosted cookie with another cookie. Gently press together.