See picture guide below.
Using the back of a small spoon, even spread a tiny bit of peanut butter on the peanut butter cup.
Stick the candy pearls to it, as you stack, gently touch each pearl to some peanut butter before adding it to secured it to the others.
Press peanut butter cup into the cupcake frosting.
Take Airheads Extremes and stick each end into the frosting to make the rainbow.
You can use a toothpick to help support it.