Line a large cookie sheet with parchment or a silicone mat. Preheat your oven to 350 degrees.

Stir the mint extract into your prepared brownie batter. Spread onto you cookie sheet until it is thinned about 1/4 inch. You want to make sure that the batter is spread fairly even to avoid burning.

Sprinkle with chocolate chips and bake for 15-20 minutes. Make sure you turn the pan halfway through for even baking. Keep a close eye on the dish to avoid over cooking.

Cool completely and break apart by hand.