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 extract, espresso powder, and peppermint extract. Whisk until fully incorporated.
03 - Sift in flour, cocoa powder, baking powder, and salt. Gently fold the mixture until just combined. Stir in dark chocolate chips.
04 - Spread the batter evenly in the prepared pan. Bake for 28 to 32 minutes, or until a toothpick inserted in the center comes out with moist crumbs.
05 - Allow the brownies to cool completely in the pan before glazing.
06 - In a small saucepan over low heat, melt dark chocolate with butter and heavy cream, stirring until smooth. Remove from heat and stir in peppermint extract.
07 - Pour the chocolate glaze over the cooled brownies and spread evenly. Sprinkle with crushed peppermint candies.
08 - Chill for 20 minutes to allow the glaze to set. Lift brownies out using parchment overhang, slice into 16 pieces, and serve.