Ingredients:
- 1 box brownie mix (for a 9-inch x 13-inch pan), plus ingredients needed to prepare brownies according to the package directions
- A handful of chocolate chips (optional)
- 1 1/2 cups confectioners’ sugar
- 2-3 tablespoons softened butter, divided
- 2-3 tablespoons milk or cream
- 3/4 teaspoon mint extract
- A few drops of green food coloring
- 1/2 cup chocolate chips
- 1-2 tablespoons butter
- 1/2 teaspoons vanilla