Preheat oven to 350 degrees. Mix brownies according to directions on box.
Spoon 1/2 the brownie mix in the pan evenly.
Place the Reese’s Peanut Butter Cups on top of the mix.
Spoon the remaining 1/2 of the brownie batter over the Reese’s.
Place the cup of Peanut Butter M&Ms over the top of the batter.
Bake for 30-35 minutes.
Cool for 10-15 minutes, cut and enjoy!