Prepare brownie mix according to bag directions. Deposit into baking sheets. Bake at 350°F for 22-25 minutes or until brownies are set all the way through. Cool completely.
For mint frosting combine white buttercreme icing, mint flavoring and green coloring and mix. Spread an even layer of frosting over brownie sheets. Place sheets in freezer until chilled. Pour warm fudge Icing over chilled brownies.
Mint, Fudge, Peppermint, Green