Preheat the the oven to 350 degrees. Either grease the bottom of the pan or Line the cupcake tin with liners.
Stir the brownie mix, water, oil and eggs in a medium bowl until well blended. If you live above 3500 feet see additional direction below.
Fill each liner or cup about 3/4 of the way full. Push 2 or 3 mini peanut butter cups into each mix. I used a measuring cup to fill the cups. Less of a mess.
Bake for about 25-30 minutes or until a toothpick inserted into a cupcake comes out almost clean. Let them cool and then enjoy!
High Altitude: 3500-6500 ft
Stir 3 Tbsp of all-purpose flour into the dry mix.
Use 1/3 Cup of water, 1/3 cup of oil and 2 eggs