S’mores Brownies Using Boxed Brownie Mix
Fudgy 9×13 brownies made with boxed mix, then topped with milk chocolate, mini marshmallows, and graham crackers and toasted until gooey.
Ingredients
Brownie base
- 1 box family-size brownie mix for a 9×13 pan about 18.3 oz / 520 g
- 2 large eggs
- ⅓ cup vegetable oil
- ⅓ cup water
S’mores topping
- 6 graham cracker sheets broken into bite-size pieces
- 2 cups mini marshmallows
- 6 oz milk chocolate chopped (equivalent to about 12 snack-size bars / ~153 g)
Instructions
- Heat oven to the temperature listed on your brownie mix box for a 9×13. Grease a 9×13 dish (or line a metal pan with parchment).
- In a bowl, stir together brownie mix, eggs, oil, and water until just combined.
- Spread batter in pan. Bake according to the box time, checking a few minutes early (you want set edges and a slightly soft center).
- Remove pan from oven. Immediately scatter chopped milk chocolate over the hot brownies.
- Sprinkle mini marshmallows evenly over the chocolate.
- Finish with graham cracker pieces on top.
- Return to oven 3–8 minutes just to puff marshmallows and soften chocolate.
- Optional: Broil 10–45 seconds to toast (watch nonstop).
- Cool at least 20–30 minutes before slicing.
Video
Notes
- Add toppings near the end so marshmallows don’t burn before brownies finish baking.
- For crunchier graham topping, use larger pieces and scatter some on after baking.
- Glass pans often need a little more bake time; start checking early either way to avoid overbaking.
- For clean slices, cool longer and wipe knife between cuts.
Nutrition
Calories: 139kcalCarbohydrates: 21gProtein: 2gFat: 6gSaturated Fat: 3gPolyunsaturated Fat: 0.3gMonounsaturated Fat: 2gTrans Fat: 0.003gCholesterol: 27mgSodium: 66mgPotassium: 64mgFiber: 1gSugar: 14gVitamin A: 40IUCalcium: 13mgIron: 1mg
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