Preheat oven to 350.
Crack egg into a large mixing bowl and whisk well. Add in greek yogurt, maple syrup, and peppermint extract and mix well until everything is combined.
In a separate bowl, combine the dry ingredients (almond flour, coconut sugar, cocoa powder, baking powder) and mix. Make sure to get out all the chunks from the almond flour and cocoa powder.
Add dry ingredients into the bowl of wet ingredients. Mix well using a hand mixer or spatula. You want the batter to be smooth!
Fold in chocolate chips. Mix again.
Grease and or line an 8x8 baking dish or individual brownie pan. Pour in batter evenly. Sprinkle more chocolate chips on top!
Bake for 25 minutes. Let cool and enjoy! I love spreading some peanut butter or chocolate hazelnut butter on top!