Decadent S'mores Brownies with Gooey Marshmallow and Chocolate

S’mores Brownies are rich, fudgy brownies topped with chocolate chunks, gooey mini marshmallows, and crunchy graham cracker pieces. They’re indulgent, easy to make, and perfect for sharing—or keeping all to yourself.

Cut the pan into 9 large squares or 16 smaller pieces. I prefer the bigger portions for maximum gooeyness.

S’mores Brownies Ingredients

Use the ingredients below for a simple, delicious tray of s’mores brownies. Exact amounts are in the recipe card further down.

Pillsbury chocolate fudge brownie mix (or your favorite boxed mix or homemade brownie batter)
Vegetable oil
Water
Eggs
Semi-sweet chocolate chunks
Mini marshmallows
Graham crackers

How to Make Chocolate Marshmallow Brownies

Preheat the oven to 350°F (175°C). Grease an 8×8-inch baking pan with non-stick spray or line it with parchment paper.
In a medium bowl, combine the brownie mix with the oil, water, and eggs according to the box instructions (or follow your homemade recipe).
Fold in about two-thirds of the chocolate chunks, then spread the batter evenly in the prepared pan.
Bake the brownies for 35 minutes.
Remove the pan from the oven and evenly sprinkle the mini marshmallows, crumbled graham crackers, and the remaining chocolate chunks over the top.
Return the pan to the oven and bake an additional 15–20 minutes, until a toothpick inserted in the center comes out slightly moist with crumbs (not wet batter).
Allow the brownies to cool for 10–15 minutes before cutting. This resting time helps the marshmallows set slightly while remaining gooey.

Storage Instructions

Store cooled brownies in an airtight container at room temperature for up to 4 days. If you prefer them warmed, reheat individual portions briefly in the microwave for 10–15 seconds to restore the gooey texture.

Other S’mores-Inspired Ideas

Try variations like fruit s’mores with fresh berries, a gooey skillet s’mores dip for dipping graham crackers, or a dessert cocktail with a graham-cracker rim for a grown-up twist.

S’mores Brownies

Fudgy brownies topped with marshmallows, chocolate chunks, and graham cracker pieces—easy, crowd-pleasing, and irresistibly gooey.

Prep Time 10 mins

Cook Time 55 mins

Total Time 1 hr 5 mins

Course Brownies and Bars

Cuisine American

Servings 9

Calories 610 kcal

Ingredients

1 box Pillsbury chocolate fudge brownie mix
2/3 cup vegetable oil
1/4 cup water
2 eggs
1 1/2 cups semi-sweet chocolate chunks
1 1/2 cups mini marshmallows
2–3 graham crackers, crumbled into ~1-inch pieces

Instructions

Preheat the oven to 350°F (175°C). Spray an 8×8-inch baking pan with non-stick spray.
Combine the brownie mix, oil, water, and eggs in a medium bowl and stir until smooth.
Fold in two-thirds of the chocolate chunks and spread the batter evenly in the pan.
Bake for 35 minutes.
Remove from the oven and evenly top with mini marshmallows, crumbled graham crackers, and the remaining chocolate chunks.
Bake an additional 15–20 minutes, until a toothpick inserted in the center comes out slightly moist with crumbs.
Allow to cool 10–15 minutes, then slice and serve.

Nutrition

Serving: 1 | Calories: 610 kcal

Carbohydrates: 68 g | Protein: 6 g | Fat: 35 g | Saturated Fat: 11 g | Sugar: 44 g

Nutrition info is an estimate and may vary based on ingredients used; use it as a general guide.

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