Preheat your oven to 350°F (175°C).
In a large mixing bowl, cream together the softened butter and powdered sugar until light and fluffy.
Mix in the vanilla extract and peppermint extract until well combined.
In a separate bowl, whisk together the flour, salt, and baking powder.
Gradually add the dry ingredients to the butter mixture, mixing until just combined.
Fold in the mint chocolate chips, ensuring they are evenly dispersed throughout the dough.
Scoop tablespoon-sized portions of dough and roll them into balls.
Place the dough balls on a parchment-lined baking sheet, spacing them about 2 inches apart.
Bake in the preheated oven for 10-12 minutes, or until the edges are lightly golden.
Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack.
Once completely cooled, dust with additional powdered sugar before serving.