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    Home » Recipes » Bars

    Published: Jun 11, 2021 by Ellie Haley · This post may contain affiliate links · 1 Comment

    Marshmallow Brookies

    Jump to Recipe Print Recipe

    These Marshmallow Brookies have a layer of chocolate cookie, a layer of fudgy brownie, and a layer of toasted marshmallows. They are the perfect fusion of three delicious desserts.

    A closeup of a marshmallow brookie in a pan

    If you asked me to choose between a warm chocolate chip cookie, a fudgy brownie, or a perfectly toasted marshmallow I would be hard-pressed to make a choice. Roll all three of those together and you have basically created a dream dessert!

    The name brookie comes from the combination of brownies and cookies in this recipe, in case you hadn't picked up on that already. I made each of these layers individually, but you could also pick up some premade cookie dough, a box of brownie mix, and some marshmallows and call it a day. You can go wrong with this combination, homemade or not!

    A straight on shot of a brookie

    Ingredients for Marshmallow Brookies:

    Ingredients for Chocolate Chip Cookie Layer:

    • Unsalted butter. I always make sure to use unsalted butter when baking because there is no “standard” for the amount of salt they can add to butter. So if you add salt to a recipe and then use salted butter you could end up with a very salty end product.
    • Granulated Sugar. This will sweeten the cookie dough and make it chewier.
    • Brown sugar. Brown sugar adds a softer texture to the finished product.
    • Eggs. It will be easier to incorporate the eggs into the batter if they are at room temperature.
    • Vanilla extract. Vanilla is a must in baked goods just like salt. Real vanilla adds a better flavor than imitation vanilla.
    • All-purpose flour. Measuring the flour correctly is very important. I suggest weighing your flour out (I use this scale). If you want to use a measuring cup, make sure you spoon the flour into the cup and level it off with a knife. Don’t use the cup to scoop directly from the flour.
    • Baking soda. This will help the cookies to rise.
    • Baking powder. This will also help the cookies to rise.
    • Salt. Salt is a must in baked goods. It will help to balance out the sweetness and improve the overall flavor.
    • Chocolate, chopped, or chocolate chips. I prefer semi-sweet chocolate, but you can use whatever you prefer.

    Ingredients for Fudgy Brownie Layer:

    • Unsalted Butter. See above note.
    • Brown Sugar. See above note.
    • Eggs. See above note.
    • Vanilla Extract. See above note.
    • All-purpose Flour. See above note.
    • Cocoa Powder. This adds to the chocolatey flavor of the brownies.
    • Salt. See above note.
    • Chocolate. See above note.

    Ingredients for Toasted Marshmallow Layer:

    • Mini Marshmallows. You can also use regular sized marshmallows if you already have them on hand.
    All of the ingredients needed for this recipe

    How to make Marshmallow Brookies

    Chocolate Chip Cookie Layer

    STEP 1: Preheat oven to 350 degrees (F). Spray an 8x8 pan with non-stick spray and line with parchment paper, leave an overhang to make it easy to remove the baked brookies.

    STEP 2: In a large bowl using a hand mixer or in the bowl of a stand mixer cream together the butter, granulated sugar, and brown sugar until light and fluffy.

    STEP 2: Add the eggs one at a time, mixing fully before adding the next. Pour in the vanilla and combine.

    STEP 4: In a medium bowl combine the flour, baking soda, baking powder, and salt. Whisk to combine.

    • The butter, sugar, vanilla, and eggs combined in a bowl
    • The dry ingredients combined in a bowl.

    STEP 5: Add the dry ingredients to the wet ingredients and mix until just combined. Be sure not to over mix.

    STEP 6: Fold in the chocolate chips or the chopped chocolate.

    The completed cookie dough in a bowl

    STEP 7: Break chunks of cookie dough off and place them in the bottom of the pan. The chunks should be about ½ to 1 inch. Repeat until there are only small gaps without cookie dough.

    STEP 8: Allow the dough to chill while you make the brownie batter.

    The cookie dough broken into chunks and placed in the prepared pan

    Fudgy Brownie Layer

    STEP 1: In a medium bowl mix with a hand mixer combine the melted butter and brown sugar. When fully combined add the eggs and vanilla. Beat until fully combined and light in color.

    STEP 2: In a small bowl combine the flour, cocoa powder, and salt. Whisk to combine and remove any lumps.

    • The wet ingredients combined in a bowl
    • The dry ingredients combined in a bowl.

    STEP 4: Add the dry ingredients to the wet ingredients. Mix until just combined.

    STEP 5: Fold the chocolate into the mixture.

    The completed brownie batter in a bowl

    STEP 6: Pour the brownie batter over the chilled cookie dough.

    The brownie batter poured over the cookie dough in the prepared pan

    Toasted Marshmallow Layer

    STEP 1: Sprinkle the mini marshmallows over the top of the brookies until almost all of the brownie batter is covered. The marshmallows will spread while baking. If you are using regular-sized marshmallows I recommend cutting them up.

    Mini marshmallows sprinkled on top of the brownie batter

    STEP 2: Bake for 35-40 minutes or until a toothpick inserted in the center comes out with only a few moist crumbs.

    STEP 3: Allow to cool completely in pan. Lift the Marshmallow Brookies out of the pan and cut into 16 squares.

    A stack of marshmallow brookies. One has a bite out of it

    More Bar Recipes

    • Snickers Cookie Bars- These bars have a shortbread base topped with a caramel and peanut mixture and a layer of chocolate.
    • No-Bake S'mores Bars- Golden graham cereal, marshmallows, and chocolate chips are combined to make these yummy bars.
    • Rhubarb Bars- A shortbread crust topped with a rhubarb custard.
    • Glazed Cherry Bars- A cookie base with a cherry pie filling and chunks of cookie on top.
    Two brookies stacked on top of each other

    More Bar Recipes from Kitchen 335

    • Banana Pudding Cheesecake Bars- a nilla wafer crust and a creamy banana flavored cheesecake.
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    • Cookies and Cream Bars- the perfect crinkly top and gooey center packed full of crushed oreo cookies.
    • Fudgy Brownies- the best homemade brownie recipe. They are loaded with melty chocolate and perfectly gooey.
    A close up of a marshmallow brookie with a bite out of it

    Disclosure: This post may contain affiliate links, meaning, at no extra cost to you, I may earn a commission if you click a link and buy something.

    Like this post? Visit my Recipe page to see more like it!

    Recipe originally posted October 2019.

    Marshmallow Brookies

    These Marshmallow Brookies have a layer of chocolate cookie, a layer of fudgy brownie, and a layer of toasted marshmallows.
    5 from 8 votes
    Print Recipe Pin Recipe
    Prep Time 20 mins
    Cook Time 35 mins
    Total Time 55 mins
    Course Dessert
    Cuisine American
    Servings 16
    Calories 300 kcal

    Ingredients
      

    For Chocolate Chip Cookie Layer:

    • 6 tablespoons (85 grams) unsalted butter softened
    • ½ cup (107 grams) brown sugar packed
    • ½ cup (99 grams) granulated sugar
    • 1 large egg
    • 1 teaspoon vanilla extract
    • 1 ½ cup (180 grams) all-purpose flour
    • ½ teaspoon baking soda
    • ½ teaspoon baking powder
    • ½ teaspoon salt
    • ¾ cup (127 grams) chocolate chopped or chocolate chips

    For Brownie Layer:

    • 12 tablespoons (170 grams) unsalted butter melted and cooled
    • 1 ¼ cup (266 grams) brown sugar packed
    • 2 large eggs
    • 2 teaspoons vanilla extract
    • ¾ cup (90 grams) all-purpose flour
    • ½ cup (42 grams) cocoa powder
    • 1 teaspoon salt
    • ¾ cup (127 grams) chocolate chopped or chocolate chips

    For Marshmallow Layer:

    • 2 cups mini marshmallows

    Instructions
     

    For Chocolate Chip Cookie Layer:

    • Preheat oven to 350 degrees (F). Spray an 8x8 pan with non-stick spray and line with parchment paper, leave an overhang to make it easy to remove the baked brookies.
    • In a large bowl using a hand mixer or in the bowl of a stand mixer cream together the butter, granulated sugar, and brown sugar until light and fluffy.
    • Add the eggs one at a time, mixing fully before adding the next. Add the vanilla and combine.
    • In a medium bowl combine the flour, baking soda, baking powder, and salt. Whisk to combine.
    • Add the dry ingredients to the wet ingredients. Mix until just combined.
    • Fold in the chocolate.
    • Break chunks of cookie dough off and place them in the bottom of the pan. The chunks should be about ½ to 1 inch. Repeat until there are only small gaps without cookie dough.
    • Allow the dough to chill while you make the brownie batter.

    For Brownie Batter:

    • In a medium bowl mix with a hand mixer combine the melted butter and brown sugar. When fully combined add the eggs and vanilla. Beat until fully combined and light in color.
    • In a small bowl combine the flour, cocoa powder, and salt. Whisk to combine and remove any lumps.
    • Add the dry ingredients to the wet ingredients and mix until just combined.
    • Fold the chocolate into the batter.
    • Pour the brownie batter over the cookie dough.

    For Marshmallow Layer:

    • Sprinkle the mini marshmallows over the top until most of the brownie batter is covered.
    • Bake for 35-40 minutes until a toothpick inserted in the center comes out with only a few moist crumbs.
    • Allow to cool completely. Lift brookies from pan and cut into 16 squares

    Nutrition

    Serving: 1brookieCalories: 300kcalCarbohydrates: 41.5gProtein: 4.7gFat: 14.2gSaturated Fat: 8.6gCholesterol: 69mgSodium: 283mgPotassium: 137mgFiber: 1.4gSugar: 25.5gCalcium: 31mgIron: 2mg
    Keyword brookie, Brownie, brownies, chocolate chip cookies, cookie dough, Cookies, marshmallow brookies, Marshmallows
    Tried this recipe?Let us know how it was!

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    Reader Interactions

    Comments

    1. Monica says

      August 30, 2022 at 8:05 pm

      5 stars
      THiS recipe was sooooo good! I tried it warm when it was just made and wasn't a fan of it. Once it was cold... game changer!!! I legit need to stop myself from eating the whole thing. 20/10 would recommend

      Reply

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    Hi, I'm Ellie!

    I am a classically trained pastry chef with a deep desire to bring delicious and beautiful recipes to the homes of others. I aim to make being in the kitchen approachable instead of intimidating

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