On serving plate, place 1 brownie round, spread 2 tablespoons of the frosting on top.Top with second brownie round, spread with another 2 tablespoons frosting. Top with third brownie round. Frost side and top of cake with 1/2 cup frosting. Immediately sprinkle with decors. Repeat to make second mini cake. Refrigerate 30 minutes. Store cakes loosely covered.