How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Chewy Chocolate Chunk Marshmallow Cookie Bars ?

You need 10 ingredients. The key ingredients include: 2 cups flour, 1/2 tsp baking soda, 1 1/2 sticks butter, melted and cooled, 1 cup brown sugar, and more.

Is Chewy Chocolate Chunk Marshmallow Cookie Bars suitable as baking & desserts?

Yes, Chewy Chocolate Chunk Marshmallow Cookie Bars falls under the Baking & Desserts category and is a great choice for this type of meal.

How do I store leftover Chewy Chocolate Chunk Marshmallow Cookie Bars ?

Store in an airtight container at room temperature for up to 3–5 days. For longer storage, freeze for up to 3 months — no need to refrigerate or reheat.

Chewy Chocolate Chunk Marshmallow Cookie Bars

Name: Chewy Chocolate Chunk Marshmallow Cookie Bars
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 2 cups flour; 1/2 tsp baking soda; 1 1/2 sticks butter, melted and cooled; 1 cup brown sugar; 1/2 cup sugar; 1 eg + 1 yolk; 2 tsp vanilla; 1 cup chocolate chunks; 3/4 cup marshmallow fluff; 1/2 cup crisped rice cereal

Bake this irresistible Chewy Chocolate Chunk Marshmallow Cookie Bars at home. Made with flour, baking soda, butter and brown sugar. Easy step-by-step in…

This Chewy Chocolate Chunk Marshmallow Cookie Bars relies on simple, everyday ingredients such as flour, baking soda, butter, melted and cooled and brown sugar. It comes together quickly and makes 4 servings, at about 1246 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

Whether you're rounding off a family dinner, bringing a treat to a gathering, or simply satisfying a sweet craving, this Chewy Chocolate Chunk Marshmallow Cookie Bars delivers. Serve it warm or at room temperature, and add a scoop of ice cream or a spoonful of whipped cream for an extra-special finish.

Updated Jun 30, 2026

Serves 4 Baking & Desserts

1246

kcal

Calories

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Preheat the oven fully and bake on the middle rack for the most even results.
Check for doneness a few minutes early — a toothpick in the center should come out with just a few moist crumbs.
Let it cool before slicing so it sets properly and holds its shape.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Use a neutral oil or a plant-based spread in place of butter for a dairy-free version.
Brown sugar instead of white sugar adds a deeper, more caramel-like flavor.
A good 1:1 gluten-free flour blend works well if you need a gluten-free version.

No specific allergen information. Please check the ingredient list for possible allergens.

My Personal Notes

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Chewy Chocolate Chunk Marshmallow Cookie Bars

Tips for the best results

Variations & substitutions

My Personal Notes

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Frequently Asked Questions