Fluffernutter Rice Krispie Bars combine the classic flavors of peanut butter and marshmallow for a no-bake treat that’s crunchy, gooey, and perfect for any occasion. These bars are easy to make, using simple ingredients, and are ideal for parties, potlucks, or an indulgent snack! If you enjoy this combo, don’t miss out on my Fluffernutter Cookies for another peanut butter-marshmallow treat!
What is a Fluffernutter?
A fluffernutter is traditionally a sandwich made with peanut butter and marshmallow fluff. Originally named the Liberty Sandwich during World War I, it gained popularity and was renamed in the 1960s as part of a marketing campaign. The combination of peanut butter and marshmallow has been a fan favorite ever since, and these bars take it to the next level by incorporating crispy rice cereal.
Ingredients & Substitutions
Peanut Butter: Use creamy peanut butter for the best texture in these bars. If you prefer a crunchier texture, feel free to substitute crunchy peanut butter.
Marshmallows: A 16-ounce (450g) bag of mini marshmallows is perfect for this recipe. If you have regular-sized marshmallows, cut them into smaller pieces.
Cereal: Any crispy rice cereal will work for this recipe. Rice Krispies is the most popular choice, but you can use your preferred brand of crispy or toasted rice cereal.
Marshmallow Fluff: For extra gooeyness, marshmallow fluff adds a creamy layer to these bars. If you don’t have any on hand, you can make your own marshmallow fluff at home!
Can I Use a Different Pan Size?
Yes! I made these bars in a 9×9-inch (23×23 cm) pan for a thick, satisfying bite. If you prefer thinner bars, you can use a 9×13-inch (33×23 cm) pan. Alternatively, use an 8×8-inch (20×20 cm) pan for even thicker bars!
How to Store Fluffernutter Rice Krispie Bars
To store these bars, keep them in an airtight container at room temperature. They will stay fresh for up to 5 days, but they’re so delicious, they might not last that long!
Ingredients
- 5 tablespoons unsalted butter
- ¾ cup (190 g) creamy peanut butter, divided
- 1 bag (16 ounces / 450 g) mini marshmallows (about 8 cups)
- 6 cups (170 g) Rice Krispies Cereal
- ½ cup marshmallow fluff
Instructions
- Prepare the Pan: Spray a 9×9-inch (23×23 cm) baking dish with nonstick cooking spray and set aside.
- Melt the Butter and Peanut Butter: In a large pot over medium heat, melt the butter and ¼ cup (64.5 g) of the peanut butter. Stir until the mixture is smooth.
- Melt the Marshmallows: Add the mini marshmallows to the pot, stirring frequently until fully melted. Once melted, remove the pot from heat.
- Mix in the Cereal: Spray a rubber spatula with nonstick spray to prevent sticking. Using the spatula, fold in the Rice Krispies cereal, stirring until well-coated.
- Add Peanut Butter and Marshmallow Fluff: In a microwave-safe bowl, heat ¼ cup (64.5 g) of peanut butter for 15-20 seconds until smooth and pourable. Gently fold the melted peanut butter and marshmallow fluff into the cereal mixture, being careful not to overmix.
- Transfer to Pan: Transfer the mixture to the prepared baking dish, pressing it into an even layer using the spatula.
- Drizzle with Peanut Butter: Heat the remaining ¼ cup (64.5 g) of peanut butter in the microwave for 15-20 seconds, then drizzle it over the top of the bars.
- Cool and Serve: Allow the bars to cool to room temperature before cutting into squares and serving.
Enjoy these gooey, crispy Fluffernutter Rice Krispie Bars! They’re sure to be a hit with both kids and adults.
