To make peanut butter cups, start by lining a muffin pan with liners or cooking spray. In a saucepan, melt peanut butter, honey, and salt over medium heat. Once smooth, pour the mixture over rice krispy cereal in a bowl, coat the cereal thoroughly.
Fill muffin cups 2/3 full with the cereal mixture, pressing it down firmly. Melt chocolate chips in the microwave and spoon it on top of the peanut butter cups. Place the muffin tray in the refrigerator to let the chocolate set.