Preheat oven to 350°F and line baking sheets with parchment paper.
Melt semi-sweet chocolate chips and butter together in microwave in 30-second intervals, stirring until smooth. Let cool slightly.
Whisk sugar into melted chocolate mixture until combined.
Add eggs one at a time, whisking well after each addition, then stir in vanilla and peppermint extracts.
In a separate bowl, whisk together flour, cocoa powder, baking powder, and salt.
Fold dry ingredients into chocolate mixture until just combined.
Fold in Andes mint chips and dark chocolate chips.
Drop rounded tablespoons of dough 2 inches apart on prepared baking sheets.
Bake for 9-11 minutes until tops are crackly and edges are set but centers are still slightly soft.
Cool on baking sheet for 10 minutes (they'll firm up as they cool), then transfer to wire rack.