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5.0 from 6 votes

No-Bake Peanut Butter Marshmallow Cereal Bars

These fast, easy, no-bake bars are a hybrid of some of my favorite bars, which include peanut butter, marshmallows, cereal and are held together with a brown sugar-caramel sauce that’s made in the micro in 1 bowl. They’re dense, wonderfully soft, with plenty of chewiness and texture and you can really sink your teeth into them. There’s no butter in the recipe, but you won’t miss it because the bars are rich and very buttery tasting.

Prep Time
5 mins
Cook Time
5 mins
Additional Time
1 hr 53 mins
Total Time
2 hrs
Servings: 1 8-by-8-inch pan, 9 to 12 squares
Calories: 288 kcal
Course: Baked Goods

Ingredients

  • 1 heaping cup creamy peanut butter use Jif, Skippy, or similar; do not use natural or homemade peanut butter
  • ½ cup light corn syrup light colored, not lite
  • ½ cup granulated sugar
  • ¼ cup light brown sugar packed
  • 1 tablespoon vanilla extract
  • 3 ½ cups Special K Cereal Corn Flakes may be subsituted, or use about 3 cups Rice Krispies cereal
  • about 5 ounces marshmallows half of one standard bag; I used large but mini are ideal

Instructions

    Cup of Yum
  1. Line an 8-inch square pan with aluminum foil leaving overhang, spray with cooking spray; set aside.
  2. In a large microwave-safe bowl, combine 1 heaping cup peanut butter, corn syrup, sugars, and heat on high power for 1 minute to melt.
  3. Stop to stir. Mixture will be on the granular side, this is okay.
  4. Return bowl to microwave and heat for 1 more minute on high power.
  5. Stir in the vanilla.
  6. Stir in the cereal and marshmallows. The marshmallows will melt to some extent, but not fully.
  7. Turn mixture out into prepared pan, packing it down somewhat firmly with a spatula, and smooth the top.
  8. Cover pan with a sheet of foil (to prevent fridge smells), and place pan in fridge to set up for about 2 hours or until set, before lifting out with foil overhang, slicing, and serving.
  9. Bars will keep airtight at room temperature for up to 1 week, in the refrigerator for up to 2 weeks, or in the freezer for up to 6 months.
  10. Adapted from Chewy Peanut Butter and Chocolate Cereal Bars

Nutrition Information

Serving 1 Calories 288kcal (14%) Carbohydrates 45g (15%) Protein 7g (14%) Fat 11g (17%) Saturated Fat 2g (10%) Polyunsaturated Fat 7g Sodium 182mg (8%) Fiber 1g (4%) Sugar 32g (64%)

Nutrition Facts

Serving: 18-by-8-inch pan, 9 to 12 squares

Amount Per Serving

Calories 288

% Daily Value*

Serving 1
Calories 288kcal 14%
Carbohydrates 45g 15%
Protein 7g 14%
Fat 11g 17%
Saturated Fat 2g 10%
Polyunsaturated Fat 7g 41%
Sodium 182mg 8%
Fiber 1g 4%
Sugar 32g 64%

* Percent Daily Values are based on a 2,000 calorie diet.