Step 1

Preheat oven to 350 degrees. Line an 8×8 pan with parchment paper and set aside.

Step 2

Whisk together sugar and butter. Add eggs, vanilla, cocoa powder and milk and whisk until smooth.

Step 3

Stir in flour, salt and mini chocolate chips, stirring until flour is well incorporated.

Step 4

Bake for 30 minutes, until brownies are set. Remove from oven and let cool for 20 minutes before frosting.

Step 5

To make Mint frosting: Combine all ingredients. Whisk until smooth. Pour over cooled brownies. Gently spread frosting over the entire surface of brownies. Chill in the refrigerator for 30 minutes before topping with the chocolate frosting.

Step 6

To make Chocolate frosting: Combine butter, chocolate chips and milk in a bowl. Microwave for 45 seconds. Add powdered sugar and whisk until smooth. Pour frosting over cooled brownies, on top of the mint frosting. Let fully cool to set.