Melt 1 stick butter in medium saucepan over low heat. Add peanut butter to melted butter, then add bag of chocolate chips to partially melted peanut butter and melted butter; stir frequently to blend mixture thoroughly until completely melted to a pourable consistency. While mixture is melting, evenly spread miniature marshmallows over the bottom of 8x12 inch (medium size) glass baking dish (no need to grease).
When completely melted and mixed, pour over marshmallows in dish and spread until even. Allow to chill in refrigerator for at least 2 hours before serving; cut into desired size bars and eat!
NOTE: Bars must be kept refrigerated. If left out, they will melt and become difficult to remove from dish.
