Preheat your oven to 350°F (175°C) and line baking sheets with parchment paper.
In a large mixing bowl, cream together the softened butter, granulated sugar, and powdered sugar until light and fluffy.
Add the vanilla extract and peppermint extract to the creamed mixture and blend well.
In a separate bowl, whisk together the flour and baking powder until combined.
Gradually add the dry ingredients to the wet mixture, mixing on low speed until just combined.
Fold in the mini chocolate chips using a spatula until evenly distributed.
Scoop tablespoons of dough and roll them into balls, then place them on the prepared baking sheets.
Bake for 10-12 minutes, or until the edges are lightly golden.
Remove the cookies from the oven and let them cool on the baking sheet for 5 minutes before transferring to a wire rack.
Once cooled, dust the cookies generously with powdered sugar for a snowy finish.