To make cake:
Use Any style Chocolate Cake mix, Prepare according to package. And add in 1 cup peanut butter. (You can add in more, I think I did. I just used two heaping spoonfuls)
For the Frosting:
I used the Cream Cheese store bought frosting. And again, I added 1 cup peanut butter. ( I added more, to give it a more peanutty taste and look)
This was really not anything fancy, but it tasted great. Like a peanut butter cup! Next time, Ill look for more of a home made one. But with 4 kids running around, this is more on my time level!