Preheat oven to 350 degrees Fahrenheit.
Mix brownies in bowl according to instructions.
Grease a muffin pan and fill each cup ¾ full of batter.
Put the brownies into the oven and bake for 10 minutes.
Remove from oven and place three mini peanut butter cups in the center of each brownie.
Place back in the oven for 20-25 minutes or until the brownies are baked through.
Remove from oven.
Grease the bottom of another muffin tin and place the tin on top of the brownies while still warm.
Allow to cool and fill the brownie bowls with custard.
Top with chocolate syrup and sprinkles.