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Brown Sugar Toffee Marshmallow Treats

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Brown Sugar Toffee Marshmallow Treats are no bake treats that you can never have just one of! Sticky, sweet, and chewy marshmallow treats are made unique with bits of toffee and the addition of brown sugar. These are SO much better than the treats that come in plastic wrappers!

A large marshmallow treat has been sliced into individual servings on a sheet of parchment paper.

I’m a sucker for a Rice Krispie treat, it’s true. Of all the pre-packaged treats in the snack aisle of the grocery store, they’re one of the only ones that’s gluten-free and comparatively low in calories! However, this homemade recipe knocks those plastic wrapped snacks way out of the park.

First off, instead of the usual toasted rice you find in marshmallow treats, these are made with plain oat cereal (like Cheerios). And guess what? It’s still gluten-free that way! I find that the Cheerios make for a better bite than Rice Krispies, since they’re crunchier and make the overall treat thicker. I feel like I get more bang for my buck!

It’s not the Cheerios that send these marshmallow treats over the top, though. Crushed Heath bar gets sprinkled throughout the mixture, lending both chocolate and toffee flavors to every bite. It’s enough to make your mouth water, trust me. These easy to make (no bake!) treats really have it all!

Several squares of marshmallow treats are stacked and separated with sheets of parchment paper.

What You’ll Need:

  • Butter – Unsalted works best here.
  • Marshmallows – Make life easier for yourself by using large marshmallows. Any brand will do the trick.
  • Brown Sugar – If you’re all out of brown sugar, no worries! You can easily make your own by combining one cup of white granulated sugar with one tablespoon of molasses.
  • Salt
  • Cheerios – A generic brand also works.
  • Heath Bar – Again, you can use a generic brand in its place if you’d prefer.
A white plate holds a single marshmallow treat.

How to Make Brown Sugar Toffee Marshmallow Treats

For more detailed instructions, scroll to the bottom of this post.

Prepare. Coat a 9×13 inch casserole dish with butter.

Melt. In a large pot, combine the marshmallows and butter. Over medium heat, stir them together as they melt down.

Add more ingredients. Remove the pot from the heat, then stir in the remaining ingredients. Add the toffee bits last.

Place in the pan. Place the mixture into the prepared dish and gently press down. Sprinkle more toffee bits on top if preferred.

Enjoy! Cool completely, then cut into individual pieces.

A single square of marshmallow treat is presented on a round white plate.

Common Questions:

How long will brown sugar toffee marshmallow treats stay fresh? In an airtight container at room temperature, these treats will stay fresh for about 4-5 days. Try to keep them out of direct sunlight to avoid any melting.

How do I prevent my knife from sticking to the treats? Butter it! The best way to make sure all that sticky, gooey marshmallow doesn’t stick to your knife as you slice the treats into pieces is to butter the knife.

A small piece of marshmallow treat is being pulled away by a hand.

Have any extra marshmallows on hand?

Brown Sugar Toffee Marshmallow Treats

Brown sugar toffee marshmallow treats are sweet, chewy, and SO easy to make. You'll love this no bake recipe!
Prep Time: 25 minutes
Total Time: 25 minutes
Servings: 12 marshmallow treats
Author: Julie Chiou
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  • ½ cup unsalted butter
  • 10.5 ounce bag large marshmallows
  • 3 tablespoons brown sugar
  • ½ teaspoon kosher salt
  • 6 cups plain oat cereal, such as Cheerios
  • 1 cup crushed chocolate toffee candy bar, such as Heath (plus a couple tablespoons to sprinkle over the top, optional)

The default measuring system for this website is US Customary. Unit conversions are provided for convenience and as a courtesy only. While we strive to provide accurate unit conversions, please be aware that there may be some discrepancies.


  • Prepare a 9×13 inch casserole dish by greasing with oil or butter.
  • In a large pot, combine the marshmallows and butter. Over medium heat melt the butter and marshmallows, stirring continuously until they are almost all melted (it is OK and actually good to still have some lumps at this point.)
  • Remove from heat, mix in the brown sugar, salt, and oats, stir to combine. Before they get too hard to stir, add in the toffee bits, but be sure to do this last.
  • Put the mixture into the prepared dish and very lightly press down.
  • Sprinkle more crushed toffee bar on top (optional).
  • Cool completely, then cut pieces into desired size. Store in an airtight container.

Recipe Notes

Spray your knife with a little oil before cutting the treats, it will help prevent them from sticking to your knife.


Serving: 1 treat | Calories: 303 kcal | Carbohydrates: 43 g | Protein: 2 g | Fat: 15 g | Saturated Fat: 8 g | Polyunsaturated Fat: 1 g | Monounsaturated Fat: 2 g | Trans Fat: 1 g | Cholesterol: 25 mg | Sodium: 240 mg | Potassium: 74 mg | Fiber: 2 g | Sugar: 30 g

This website provides approximate nutrition information for convenience and as a courtesy only. Nutrition information can vary for a variety of reasons. For the most precise nutritional data use your preferred nutrition calculator based on the actual ingredients you used in the recipe.

Course: Snack
Cuisine: American
Keyword: bar recipe, marshmallow treat
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