01 - Preheat oven to 350°F. Line an 8-inch square baking pan with parchment paper, allowing overhang for easy removal.
02 - Microwave butter and chopped chocolate in 30-second intervals, stirring until completely smooth. Set aside to cool briefly.
03 - Whisk granulated sugar, eggs, and vanilla extract into the chocolate mixture until glossy and thoroughly combined.
04 - Gently fold flour and salt into the batter just until incorporated. Avoid overmixing to maintain fudgy texture.
05 - Spread batter evenly in prepared pan. Bake for 25 to 30 minutes until a toothpick inserted shows moist crumbs. Cool completely.
06 - Beat softened butter with powdered sugar, milk, peppermint extract, and food coloring until smooth and spreadable.
07 - Spread mint mixture evenly over cooled brownies. Refrigerate for 15 minutes to firm.
08 - Microwave chocolate chips with vegetable oil in 20-second bursts, stirring until completely smooth.
09 - Pour chocolate glaze over mint layer, spreading gently to cover. Refrigerate at least 30 minutes until set.
10 - Lift brownies from pan using parchment. Cut into squares and serve chilled or at room temperature.