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.
09 - Remove brownies from the pan using the parchment overhang. Cut into squares and serve.