Preheat oven to 350 degrees. In hot oven, melt the butter in a 9x13-inch pan. Remove from oven.
Stir in graham cracker crumbs and spread evenly over the bottom of the pan. Pour sweetend condensed milk evenly over the crumbs. Sprinkle with a layer of peanut butter chips, chocolate chips, then the peanuts; press gently onto the base.
Bake 25 minutes or until edges are golden brown. Chill at least 1 hour before cutting into bars.Yield will be 36-44 with enough crumbs to munch for the cook!