Spray a 9x13 pan with cooking spray, or lightly butter it.
Measure out 6 cups of Rice Krispies.
In a large pan (I use a Dutch oven) start heating the marshmallows, butter, and peanut butter. Use a silicone spoonula to scrape the pan almost constantly as everything melts so nothing scorches. Keep stirring until all the marshmallows have melted and the mixture is smooth.
When everything is well combined, remove the pan from the heat and fold in the Rice Krispies. I like to use a silicone spoonula for this.
Turn the mixture into your prepared pan and press out into an even layer. It helps to use a sheet of parchment or waxed paper to keep your hand from sticking.
Melt the chocolate and butter together until smooth and silky. You can do this in a saucepan over a double boiler, or in the microwave. In the microwave heat for 1 minute on full power and the stir. If necessary microwave in 15 second bursts until the chocolate has melted. Let the heat of the bowl do the final melting, as you stir. Take care not to over heat the chocolate or it will seize up.
Spread the chocolate over the Rice Krispie base and let the chocolate set up at room temperature for at least 2 hours before slicing into bars.
Leftover treats can be stored at room temperature or in the refrigerator and will stay fresh for several days.
Notes
Freezing: If you want to extend the shelf life further, you can freeze Rice Krispie Treats. Place them in an airtight container or wrap them in plastic wrap and then put them in a freezer-safe bag. When properly stored in the freezer, Rice Krispie treats can last for up to 2 to 3 months.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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