01 - Preheat oven to 350°F. Line a 9-inch square baking pan with parchment paper, allowing overhang for easy removal.
02 - Melt ½ cup plus 2 tablespoons butter in a saucepan or microwave. Whisk melted butter with 1 cup granulated sugar in a large bowl until combined. Beat in 2 eggs and 1 teaspoon vanilla extract.
03 - Sift ⅔ cup flour, ½ cup cocoa powder, and ½ teaspoon salt into the wet mixture. Stir until just combined, taking care not to overmix.
04 - Spread batter evenly in prepared pan. Bake for 22 to 25 minutes until a toothpick inserted in the center comes out with moist crumbs. Cool completely in the pan.
05 - Beat softened ½ cup butter until creamy. Gradually add 2 cups powdered sugar, 2 tablespoons milk, 1 teaspoon peppermint extract, and food coloring. Beat until smooth and spreadable.
06 - Spread mint cream evenly over cooled brownies. Refrigerate for 15 minutes to set the layer.
07 - Melt ¾ cup chocolate chips and 2 tablespoons butter together using microwave or double boiler, stirring until smooth.
08 - Pour glaze over mint layer and spread evenly. Refrigerate for at least 30 minutes until set. Lift brownies from pan using parchment overhang, cut into squares, and serve.