In a large mixing bowl or stand mixer, combine brownie mix and protein powder.
Add yogurt and mix until well combined.
Drop dough using a cookie scoop or spoon onto a baking sheet sprayed with nonstick cooking spray.
Bake for 10-12 minutes, or until set.
Remove from oven and immediately place one Andes Mint on top of each cookie. Allow the mint to melt then spread it on top of the cookie using a spoon or small spatula.