"Edit this bar recipe to avoid any need for a hand mixer, stand mixer, or pastry blender. Replace the chopped peanuts with Reese's Pieces, keep the mini peanut butter cups, and create a no-stovetop chocolate topping. Use imperial units. Provide the full revised recipe with ingredients and step-by-step instructions, preserving the original bar format and baking method as much as possible while making the mixing method simple and hand-mix friendly."