2Pat into a large jelly roll pan (or a large pan with a lip if you don't have a jelly roll pan). Bake for 12 minutes @ 350 degrees on bottom rack of oven.
Remove from oven and add miniature marshmallows evenly over top and bake 1-2 minutes until melted, being careful they don't burn.
3Melt together peanut butter chips, 1/4 cup butter, vanilla and corn syrup. I like to do this in a microwave safe dish, stirring every 2 minutes until chips are melted.
4Add peanuts and rice krispies quickly, and pour over the two layers. Cool, cut and enjoy.