Skip to Content

Chocolate Marshmallow Bars

Last Updated on October 28, 2021 by

Disclosure: This post may contain affilIiate links or sponsored content. As an Amazon Associate, I earn from qualifying purchases. All opinions are my own.

Ooey, gooey, chocolately treats that are so simple to make! Just a few ingredients and these chocolate marshmallow bars will be ready for a delicious dessert!

chocolate marshmallow bars

Do you crave the rice krispy bars from childhood? That marshmallow-y goodness and the crisp of the rice cereal brings back so many memories for me. Of course, I wanted to share that with my kids. Here is what we came up with. A new twist, adding loads of yummy chocolate, a shortbread type crust, and loads of yumminess!

These chocolate marshmallow bars are easy to fix, and only take a few simple ingredients. I’ll be willing to be that you have most of them on hand already!

marshmallow bars post 1

Ingredients you need:

For the bars:

  • 1/4 cup unsalted butter – softened
  • 1 1/2 cups granulated sugar
  • 3 eggs
  • 1 tsp vanilla extract
  • 1 1/3 cup all purpose flour
  • 3 tbsp unsweetened cocoa
  • 1/2 tsp baking powder
  • 1/2 tsp salt
  • 7oz tub of marshmallow fluff
chocolate marshmallow bars ingredients


  • 1 1/3 cup semi sweet chocolate chips
  • 1 1/2 – 2 cups miniature marshmallows
  • 3 tbsp unsalted butter
  • 2 cups rice crispy cereal

Equipment you’ll want:

Making your chocolate marshmallow bars

  1. Preheat oven and prepare baking sheet.
  2. In a bowl, mix together butter and sugar. Add eggs and vanilla.
  3. Using a separate bowl, combine flour, cocoa powder, and salt. Add it to the wet ingredients until combined. spread in the bottom of the pan.
  4. Bake, then remove from the oven and cool slightly.
  5. Prepare the topping then spoon over the bottom crust, moving quickly.
  6. Chill until top is set.

How should I store these bars?

They are best stored in an airtight container on the countertop. If you stick them back in the fridge, they may harden and be too hard to eat. However, if you want to keep them longer, they can freeze. Just thaw on the counter before eating.

Other desserts you’ll want to try:

Chocolate Marshmallow Bars

Ooey, gooey, chocolate goodness! The combination of sweet chocolate, gooey marshmallows and crispy rice will make a family pleasing dessert!

Prep Time 20 minutes
Cook Time 25 minutes
Servings 24 bars


For the bars

  • 1/4 cup unsalted butter softened
  • 1 1/2 cups granulated sugar
  • 3 large eggs
  • 1 teaspoon vanilla extract
  • 1 1/3 cups all purpose flour
  • 3 Tablespoons unsweetened cocoa
  • 1/2 teaspoon baking powder
  • 1/2 teaspoon salt
  • 1 7 ounce tub marshmallow fluff

For the topping

  • 1 1/3 cups semi sweet chocolate chips
  • 1 1/2 cups minature marshmallows
  • 3 Tablespoons unsalted butter
  • 2 cups rice crispy cereal


  1. Preheat oven to 350 degrees. Prepare a 15x10x1 baking sheet by lining it with foil and spraying the foil with non-stick spray.

  2. In a small bowl, mix the butter and sugar together until it’s just combined. Add in the eggs, mixing between each addition. Then, add in the vanilla and mix until combined.

  3. In another bowl,whisk together the flour, cocoa powder and salt. Slowly add it to the wet ingredients and mix until well combined. Spread the batter into the prepared pan and bake for 15-18 minutes.

  4. Once the cake is done cooking, immediately spread the marshmallow fluff all over the top. The heat will help the fluff spread. Cool for about 30 minutes.

  5. Once cooled, prepare the topping by adding the chocolate chips,marshmallows and butter to a saucepan and melting it over medium heat. Once melted, stir in the rice crispies until completely coated.

  6. Spoon or scoop the topping onto the fluff layer and carefully spread it all over the top. Move kind of quickly as the topping will harden up if not spread quickly.

  7. Chill in the fridge until the top is set. Cut into bars and serve! Store in an airtight container at room temperature.

Recipe Rating