01 - Preheat oven to 350°F. Line an 8-inch square baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a large bowl, whisk together melted butter, granulated sugar, and brown sugar until smooth. Add eggs, vanilla, espresso powder, and peppermint extract; whisk until fully blended.
03 - Sift flour, cocoa powder, baking powder, and salt into the wet mixture. Fold gently until just combined, then stir in dark chocolate chips.
04 - Spread batter evenly in prepared pan. Bake for 28–32 minutes or until a toothpick inserted in the center comes out with a few moist crumbs.
05 - Allow brownies to cool completely in the pan before glazing.
06 - Over low heat, melt dark chocolate with butter and heavy cream in a small saucepan, stirring until smooth. Remove from heat and stir in peppermint extract.
07 - Pour the glaze evenly over cooled brownies. Sprinkle crushed peppermint candies over the top.
08 - Refrigerate for 20 minutes to set glaze. Lift brownies out using parchment overhang; slice and serve.