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Toasted Marshmallow K-Bars Recipe

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3.9 from 11 reviews

These Toasted Marshmallow K-Bars are a delightful twist on classic rice crispy treats, featuring toasted marshmallows and a rich peanut butter and chocolate layer. Perfectly crunchy and gooey, with a sprinkle of flaky sea salt to enhance the flavors, they make an irresistible sweet treat for any occasion.

Ingredients

Base Mixture

  • 1/2 cup (1 stick) salted butter, at room temperature
  • 1 cup creamy peanut butter
  • 1 bag (10 ounce) mini marshmallows
  • 5 cups Corn Flakes or Rice Krispies cereal

Toasted Marshmallows

  • 2 cups regular marshmallows

Topping

  • 20 ounces semi-sweet or dark chocolate, melted
  • Flaky sea salt (optional)

Instructions

  1. Prepare your pan and broiler: Line a 9×13 inch pan with parchment paper to prevent sticking. Preheat your oven's broiler to get it ready for toasting the marshmallows.
  2. Melt butter and peanut butter: In a large pot over medium heat, add the butter and peanut butter. Let the butter fully melt and combine with the peanut butter. Reduce the heat to low to prevent burning as you proceed.
  3. Melt mini marshmallows: Add the mini marshmallows into the pot. Stir continuously until completely melted and smooth, about 5 minutes. Remove the pot from heat once the mixture is ready.
  4. Add cereal: Gently fold in the Corn Flakes or Rice Krispies cereal into the melted marshmallow mixture, ensuring all the cereal is coated evenly.
  5. Toast regular marshmallows: Place the 2 cups of regular marshmallows on a baking sheet. Broil them for 1 to 2 minutes until they are golden brown and toasted, but watch carefully to prevent burning as they toast quickly.
  6. Combine toasted marshmallows: Mix the toasted marshmallows into the cereal mixture immediately, then quickly transfer everything into the prepared parchment-lined pan. Spread evenly and press down firmly to compact the bars.
  7. Add chocolate topping: Pour the melted semi-sweet or dark chocolate evenly over the packed cereal and marshmallow mixture. Optionally, sprinkle flaky sea salt on top to enhance flavor.
  8. Chill and set: Refrigerate the pan for at least 1 to 2 hours until the chocolate topping firms up and the bars are set.
  9. Serve: Once chilled, cut into 24 bars and enjoy these delicious toasted marshmallow treats!

Notes

  • Use either Corn Flakes or Rice Krispies cereal based on your preference.
  • Watch the marshmallows closely while broiling—they can burn quickly.
  • Pressing the mixture firmly into the pan helps the bars hold together better.
  • For a dairy-free option, substitute the butter with a plant-based alternative and ensure the chocolate is vegan.
  • Store leftovers in an airtight container in the fridge for up to 5 days.