Check out my Peanut Butter Bars. It uses melted choc chips on top and it tastes like a Reese's Pieces bar.
http://www.quiltingboard.com/t-25899-1.htm
I also love to put choc chips in peanut butter cookie dough. They are terrific!! I don't use the fork to smash them down like you do for peanut butter cookies. They are one of my favorites!