Preheat oven to 350F. Line baking sheet with parchment paper.
In a bowl mix together creamy peanut butter, sugar and an egg until you get a thick cookie dough.
Chop up peanut butter cups so they are small bite size pieces, dump into bowl with batter and gently fold together.
Use a small cookie scoop so they are all the same size. Put on to sheet pan with space between them and gently press down so they are 1/2" thick, this will make 12-16 depending on their size.
Bake for 10 minutes until middle no longer looks raw but is still very soft for soft cookies, 12 minutes for crispy cookies. Leave on baking sheet until cook, then enjoy.