01 - Preheat oven to 350°F. Grease a 24-cup mini muffin tin or line with mini paper liners.
02 - In a medium saucepan, melt the butter over low heat. Remove from heat and whisk in granulated sugar and brown sugar until smooth.
03 - Add eggs, vanilla extract, and mint extract; whisk until combined.
04 - Sift in flour, cocoa powder, and salt. Stir until just combined—do not overmix.
05 - Spoon batter evenly into prepared muffin cups, filling each about 3/4 full.
06 - Bake for 16–18 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs. Let cool in the tin for 10 minutes, then transfer to a wire rack to cool completely.
07 - Place chocolate chips in a heatproof bowl. Heat heavy cream in a small saucepan until just simmering, then pour over the chocolate. Let sit for 2 minutes, then add mint extract and stir until smooth and glossy.
08 - Spoon or pipe ganache onto each cooled brownie bite. Garnish with crushed peppermint candies or chocolate shavings if desired.
09 - Allow ganache to set before serving.