Easy Brownies with Box Mix
Lazy girl s’mores brownies are a dream come true for anyone who craves something sweet without the fuss of complex baking techniques. These brownies take the classic s’mores combination, featuring graham crackers, chocolate, and marshmallows, and elevate it with the ease of a box mix. The result is a luscious, gooey treat that captures both the nostalgia of campfire desserts and the simplicity perfect for any occasion. Whether you’re solving a midnight chocolate craving or looking for a quick dessert to impress your guests, these brownies deliver.
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There’s just something comforting about pouring brownie mix into a bowl and creating a delicious treat. This recipe is all about ease and indulgence. With the help of a box mix, you’ll whip up these delightful brownies in no time. Once you get that first mouthful of rich chocolate with melted marshmallow cascading on top, you’ll be hooked. Trust me; these brownies will become a go-to for gatherings, housewarmings, or cozy nights in. I can’t wait for you to try them!
Why You’ll Love This Recipe
- Simple & Quick: Ready in about an hour, from mixing to baking to enjoying.
- Irresistible Flavor: Rich chocolate brownies paired with gooey marshmallows and crunchy graham crackers create a fantastic flavor explosion.
- Eye-Catching Appeal: The toasted marshmallows on top give these brownies a stunning, Instagram-worthy finish.
- Flexible Serving: Perfect for dessert, a snack, or even breakfast on a sweet indulgent day.
- Diet-Friendly Options: You can easily adapt to gluten-free brownie mix for those with dietary restrictions.
Ingredients You’ll Need
- 5 graham cracker sheets: These provide the base for our s’mores brownies, creating that classic crunch and flavor. Feel free to use gluten-free graham crackers if needed.
- 1 box of brownie mix for an 8×8 inch pan: A shortcut that ensures consistent results. Choose a brand you love for the best flavor.
- 2 egg yolks: Adding just the yolks gives a dense, fudgy texture to your brownies. If you’re making a larger batch, consider saving the whites for meringues or another recipe.
- 1/2 cup vegetable oil or melted butter: Use vegetable oil for a lighter texture or melted butter for that delicious, buttery taste. Stick to the one you love!
- 1/3 cup brewed hot coffee: This might sound surprising, but the coffee enhances the chocolate flavor beautifully without any coffee taste. Use decaf if you prefer!
- 1 tsp vanilla extract: A must-have for that warm, sweet aroma; it rounds out the flavors. Opt for pure vanilla extract for the best taste.
- 1/4 tsp salt: This tiny addition balances the sweetness of the brownies perfectly.
- 1/2 cup chocolate chips: Optional, but the extra chocolate elevates these brownies to another level. Choose semi-sweet or dark chocolate for a richer taste.
- 2 cups mini marshmallows: This is what gives the brownies their classic s’mores vibe. You can substitute with regular marshmallows, but they may take longer to melt.
How to Make Easy Brownies with Box Mix
- Preheat the Oven: Start by preheating your oven to 325°F (163°C). While that’s heating up, line the bottom of your 8×8 inch baking pan with parchment paper or aluminum foil, leaving some overhang for easy removal later.
- Prepare the Graham Crackers: Place the graham cracker sheets on the bottom of the pan in a single layer, breaking them as needed to cover the entire surface.
- Mix the Brownie Batter: In a large bowl, combine the brownie mix, 2 egg yolks, 1/3 cup brewed hot coffee, 1/2 cup vegetable oil or melted butter, 1 tsp vanilla extract, and 1/4 tsp salt. Stir until well combined, then fold in 1/2 cup chocolate chips for extra richness.
- Bake the Brownies: Carefully pour the brownie batter over the graham crackers in the prepared pan. Bake for about 40 minutes or until the edges are set and the center looks just slightly fudgy.
- Add the Marshmallows: Remove the brownies from the oven and sprinkle 2 cups of mini marshmallows over the top. Return them to the oven for an additional 3-4 minutes. You want the marshmallows to become soft and puffy.
- Toast the Marshmallows: Once the marshmallows are soft, remove the pan from the oven. For some delicious caramelization, use a kitchen torch to toast them until golden brown. If you don’t have a torch, place the brownies under a broiler, keeping a close eye to prevent burning.
- Cool and Slice: Allow the brownies to cool completely before slicing. When you’re ready, use the parchment overhang to lift them out of the pan for easy cutting.
Storing & Reheating
For best results, store your Lazy girl s’mores brownies at room temperature in an airtight container. They’ll stay fresh for about 3-4 days. If you want to keep them longer, consider refrigerating them—not more than a week. You can also freeze brownies for up to three months. Just wrap them tightly in plastic wrap and foil. To reheat, pop them in the microwave for 10-15 seconds or in a preheated oven at 350°F until warm. Keep in mind that freezing and reheating can change the texture slightly, but they remain delicious!
Chef’s Helpful Tips
- Always preheat your oven! This ensures even baking.
- Make sure to measure your ingredients accurately for consistent results.
- When mixing the brownie batter, do not overmix; fold just until combined to keep them fudgy.
- If you don’t have egg yolks, you can use a full egg, but this may slightly alter the texture.
- For a fun twist, add a layer of caramel or peanut butter in between the graham cracker and brownie layers.
Lazy girl s’mores brownies are not just easy to make but also absolutely decadent. The fantastic combination of flavors and textures will please even the pickiest of eaters. Feel free to get creative with toppings! You might add some crushed nuts, drizzle with caramel or chocolate sauce, or throw in some candy pieces. Cooking is all about experimenting, so don’t hesitate to explore your options!

Recipe FAQs
Can I use a different size pan?
If you want to use a larger 9×13 inch pan, simply double the recipe. The baking time may increase slightly, so keep an eye on them, testing with a toothpick for doneness.
What’s the best handle for marshmallows?
For even and consistent browning, a kitchen torch is best. However, if you’re using a broiler, make sure you stand right by the oven to avoid burning. It should only take a minute or two.
How can I make these brownies gluten-free?
You can easily adapt this recipe by using a gluten-free brownie mix instead of the regular one. Just check that your graham crackers are gluten-free as well.
Can I make these ahead of time?
Absolutely! You can prepare them a day or two in advance. Just store them in an airtight container in the refrigerator. Allow them to come to room temperature before serving for the best flavor and texture.
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📖 Recipe Card

Easy Brownies with Box Mix
- Prep Time: 10 minutes
- Cook Time: 43 minutes
- Total Time: 53 minutes
- Yield: 16 servings 1x
- Category: Desserts & Appetizers
- Method: Baking
- Cuisine: American
Description
Savor the delightful combination of graham crackers and chocolate chips in these Easy Brownies with Box Mix. Simple to make and perfect for gatherings or satisfying your sweet tooth, this dessert is a must-try for any chocolate lover looking for quick and tasty homemade treats.
Ingredients
- 5 graham cracker sheets
- 1 box of brownie mix for an 8×8 inch pan
- 2 egg yolks
- 1/2 cup vegetable oil or melted butter
- 1/3 cup brewed hot coffee
- 1 tsp vanilla extract
- 1/4 tsp salt
- 1/2 cup chocolate chips
- 2 cups mini marshmallows
Instructions
- Preheat the oven to 325°F and line the bottom of an 8×8 inch baking pan with parchment paper or aluminum foil, allowing for overhang on the sides.
- Arrange the graham cracker sheets in a single layer on the bottom of the pan, breaking them as needed to cover entirely.
- In a large mixing bowl, combine the brownie mix, egg yolks, brewed hot coffee, vegetable oil, vanilla extract, and salt. Gently fold in the chocolate chips.
- Pour the brownie mixture over the graham cracker layer in the prepared pan and bake for 40 minutes.
- Remove the brownies from the oven and top with mini marshmallows. Return to the oven and bake for an additional 3-4 minutes until marshmallows are slightly toasted.
- Once baked, use a kitchen torch to toast the marshmallows further if desired. Let the brownies cool completely before slicing.
Notes
For easier slicing, allow the brownies to cool in the fridge for a short time after they have cooled to room temperature.
Feel free to substitute melted butter for the vegetable oil for a richer flavor.
Experiment with different types of chocolate chips, such as dark or white chocolate for varied taste.
Nutrition
- Serving Size: 1 brownie
- Calories: 150
- Sugar: 10g
- Sodium: 130mg
- Fat: 7g
- Saturated Fat: 3g
- Unsaturated Fat: 4g
- Trans Fat: 0g
- Carbohydrates: 20g
- Fiber: 0g
- Protein: 2g
- Cholesterol: 50mg
