What is great about this recipe is that you can use Yellow Cake instead of Chocolate Cake. This allows the Peanut Butter to really come through when using the yellow cake. I leave it up to the chocolate outside layer to bring in the chocolate flavor. But if you'd like, you can use chocolate cake.
Make cake according to package directions and cool cake.
Crumble cake with forks and mix in both peanut butter. Scoop 1" balls or use cookie scoop to form cake balls. Smooth out balls with your hands and place on parchment paper lined cookie sheets. Chill or freeze cake balls.
Melt chocolate and roll cake balls and throughly coat with chocolate and place back on cookie sheets with parchment paper. Sprinkle with chopped peanuts or drizzle with melted peanut butter chips or coating. Let set and serve. I've noticed that if you do this the night before the flavors mingle better.