To make Rice Krispies peanut butter balls, combine peanut butter, butter and powdered sugar. Stir Rice Krispies cereal through the mixture, and then shape it into small balls. After refrigerating the balls, coat them in melted chocolate.
Many variations of this recipe are available online. RiceKrispies.com suggests melting semi-sweet chocolate chips and vegetable shortening together to make a candy coating, then spooning the coating over the chilled balls. The site recommends placing the balls in mini muffin cups and storing them in a sealed container in the refrigerator.
TasteOfHome.com offers a recipe that yields a larger batch for holiday gatherings. It also suggests adding a touch of elegance by drizzling melted white baking chips over the balls. The site notes that reduced-fat peanut butter is not suitable for this recipe.
FoodNetwork.com takes an entirely different direction with the recipe, using a corn syrup mixture to bind the balls. To make this version, combine sugar, white corn syrup and dark corn syrup over medium heat. After a few minutes, remove the mixture from the heat, and incorporate peanut butter. Add rice cereal, and form small balls by hand. The site states that these peanut butter balls can simply be stored in an airtight container.