01 - Preheat oven to 350°F. Line a 9-inch square baking pan with parchment paper, leaving an overhang for easy removal.
02 - Melt butter in a saucepan or microwave. In a large bowl, whisk together melted butter and sugar until combined. Add eggs and vanilla, mixing well.
03 - Sift in flour, cocoa powder, and salt. Stir until just combined. Spread batter evenly in the prepared pan.
04 - Bake for 22-25 minutes, until a toothpick inserted in the center comes out with moist crumbs. Cool completely in the pan.
05 - Beat softened butter until creamy. Gradually add powdered sugar, milk, peppermint extract, and green food coloring; beat until smooth and spreadable.
06 - Spread mint cream evenly over the cooled brownies. Chill in the refrigerator for 15 minutes to set.
07 - Melt chocolate chips and butter together until smooth using a microwave or double boiler.
08 - Pour the glaze over the mint layer and spread evenly. Refrigerate for at least 30 minutes, until set. Remove brownies from the pan using the parchment overhang. Cut into squares and serve.