Mix Dry Ingredients: Whisk together flour, cocoa powder, baking powder, and salt.
Combine Wet Ingredients: In large bowl, mix melted coconut oil, coconut sugar, eggs, vanilla, and peppermint extract until smooth.
Add Chocolate: Stir in melted dark chocolate chips until combined.
Form Dough: Gradually add dry ingredients to wet mixture, stirring until just combined.
Chill: Cover bowl and refrigerate dough for 2 hours or overnight.
Preheat Oven: Set to 350 degrees F and line baking sheets with parchment paper.
Shape & Coat: Scoop dough into 1-inch balls. Roll first in granulated sugar, then in powdered sugar to coat completely.
Bake: Place cookies 2 inches apart on prepared sheets. Bake 12-14 minutes until edges are set and tops have cracked.
Cool: Let cool on sheets 10 minutes before transferring to cooling rack.