01 - Preheat oven to 350°F. Grease a 24-cup mini muffin tin or line with mini paper liners.
02 - Place butter and chopped chocolate in a heatproof bowl set over a pot of simmering water. Stir until completely smooth and melted. Remove from heat and let cool slightly.
03 - Whisk sugar, eggs, vanilla extract, and peppermint extract into the chocolate mixture until thoroughly combined.
04 - Sift flour, cocoa powder, and salt into the batter. Fold gently until just combined. Avoid overmixing to maintain fudgy texture.
05 - Spoon batter evenly into prepared mini muffin cups, filling each about 3/4 full.
06 - Bake for 12 to 15 minutes until tops appear set and a toothpick inserted in the center comes out with moist crumbs.
07 - Let brownie bites cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.
08 - Place chopped chocolate in a small bowl. Heat cream in a small saucepan until steaming, then pour over chocolate. Let sit for 1 minute. Add peppermint extract and stir until smooth and glossy.
09 - Spoon or pipe ganache onto each cooled brownie bite. Garnish with fresh mint leaves or chocolate shavings if desired. Allow ganache to set before serving.