Marshmallow Brownie Cookie Sandwiches
Highlighted under: Best Desserts | Yummy Sweets
Rich, fudgy brownies sandwiched between soft, chewy cookies with a gooey marshmallow center that’s a real treat. I can smell the chocolate wafting through the kitchen as these bake. It brings back such great memories of baking with my kids on a lazy weekend day. The combination is simple but just right, and my daughter couldn’t stop raving about them as she devoured her second sandwich. Honestly, her happiness is all I need to keep making these.
I've always loved the idea of merging my two dessert favorites into one delicious sandwich, so when I finally decided to try my hand at these, I was surprised at how well they turned out. The blend of a brownie and cookie is just irresistible, and the marshmallow filling? Pure magic, honestly.
The best part is how easy it is to customize. You can use any brownie recipe you like, and as for the cookies, even store-bought ones work in a pinch. Just keep an eye on your baking times. I learned the hard way that overcooking makes them dry - no one wants that in a sandwich!
What I Love About This
- My daughter practically begs for these cookies now
- The chewy texture is just unreal
- You can get creative with mix-ins or dips
Key Technique for Marshmallow Brownie Cookie Sandwiches
One key to these sandwiches is knowing when the brownie layer is done baking. Since you want them a little underbaked, keep a close eye on them after 15 minutes. They should still look a bit soft in the center. If you overbake them, your sandwiches might be more crumbly than gooey, which is definitely not what we're after.
When you're assembling the sandwiches, make sure to squish the cookie dough around the brownie and marshmallows just enough to seal them in. If they’re not sealed well, the marshmallows might ooze out too much during baking. No one wants a messy kitchen, but honestly, a little mess can lead to great laughter.
Swaps & Substitutions
If you're out of brown sugar, regular granulated sugar works too. But if you have some molasses lying around, adding a teaspoon can mimic that rich flavor brown sugar offers. This whole recipe is pretty forgiving, so it's okay to experiment a bit.
Want to make these a bit more exciting? Try swapping some of the chocolate chips for peanut butter chips or even switching up the marshmallows for flavored ones. My daughter insists that mini chocolate marshmallows are a must-try, although it might be a little over-the-top for some!
Ingredients
Gather these simple ingredients to make delicious marshmallow brownie cookie sandwiches.
Brownie Base
- 1 cup granulated sugar
- 1/2 cup packed brown sugar
- 1/2 cup unsalted butter, melted
- 2 large eggs
- 1 tsp vanilla extract
- 1 cup all-purpose flour
- 1/3 cup unsweetened cocoa powder
- 1/4 tsp salt
Cookie Base
- 1/2 cup unsalted butter, softened
- 1/2 cup granulated sugar
- 1/4 cup brown sugar, packed
- 1 large egg
- 1 tsp vanilla extract
- 1 1/2 cups all-purpose flour
- 1/2 tsp baking soda
- 1/4 tsp salt
- 1 cup chocolate chips
Marshmallow Filling
- 1 cup mini marshmallows
Make sure to have everything ready before you start baking – it’ll make the process so much smoother!
Instructions
Here’s how to make these sandwich treats, step-by-step.
Prepare the Brownie Layer
Preheat your oven to 350°F (175°C). In a bowl, mix together the granulated sugar, brown sugar, and melted butter until smooth. Stir in the eggs and vanilla, then add the flour, cocoa powder, and salt. Pour this mixture into a greased 8x8 inch baking pan and bake for about 20 minutes. You want them to be a bit underbaked, as they'll firm up while cooling.
Make the Cookie Dough
While the brownies are cooling, cream together the softened butter, granulated sugar, and brown sugar in a separate bowl until it’s fluffy. Add the egg and vanilla, mixing until smooth. Then, combine the flour, baking soda, and salt in another bowl before gradually adding it to the wet mixture. Stir in the chocolate chips. You can totally taste-test the dough, just remember to save some for the sandwiches.
Assemble the Sandwiches
Once the brownies have cooled, cut them into squares. Take a cookie dough scoop and flatten it out a bit, placing a brownie square and some marshmallows in the center. Then, top it with another flattened scoop of cookie dough. Bake the assembled sandwiches on a baking tray for about 12 minutes at 350°F (175°C). You’ll know they’re done when the edges start to turn golden brown.
Cool and Serve
Let these sandwiches cool for a few minutes on the baking tray, and then transfer to a wire rack to cool completely. I often break one open to let the marshmallow ooze out a bit before serving – it’s such a fun way to enjoy them!
Enjoy the sandwiches as a special treat or bring them to a gathering – they’re sure to impress!
Pro Tips
- If you find the cookie dough too sticky, add a touch more flour.
- These can be stored in an airtight container for up to a week, though I doubt they'll last that long!
- Try adding nuts or dried fruit to the brownie base for a different twist.
How to Store Marshmallow Brownie Cookie Sandwiches
To keep these sandwiches fresh, I usually store them in an airtight container at room temperature. They'll last a couple of days, but trust me, they tend to disappear quickly. If you're lucky enough to have leftovers, you can pop them in the fridge if you prefer a chilled treat.
If you're worried about the marshmallows getting too firm in the fridge, just keep the sandwiches at room temperature in a sealed container. I find they’re best enjoyed within a few days of making them, but if you must, these also freeze well. Just separate layers with parchment paper.
Ways to Switch It Up
Feeling adventurous? You could mix in some chopped nuts or a swirl of peanut butter into the brownie layer for added texture and taste. Just be careful not to overmix when adding in your extras, as you still want those fudgy brownies to shine through.
If you really want to have fun, consider drizzling some melted chocolate or caramel on top of your sandwiches right before they cool completely. It gives a nice finish, and the chocolate drizzles can hide any little imperfections, should they occur. Honestly, I’ve never had any complaints about a little chocolate on top!
Questions About Recipes
→ Can I use store-bought brownies?
You can, but I wouldn't. The homemade brownies really add something special and they're super easy to make.
→ What else can I add to the cookie dough?
Honestly, chocolate chunks or nuts work great! My kids love it when I throw in peanut butter chips.
→ How do I keep these from getting too dry?
Keeping the brownies slightly underbaked helps, plus letting them cool properly before serving makes a huge difference.
Marshmallow Brownie Cookie Sandwiches
Created by: The Chefoscarkitchen Team
Recipe Type: Best Desserts | Yummy Sweets
Skill Level: Intermediate
Final Quantity: 12.0
What You'll Need
Brownie Base
- 1 cup granulated sugar
- 1/2 cup packed brown sugar
- 1/2 cup unsalted butter, melted
- 2 large eggs
- 1 tsp vanilla extract
- 1 cup all-purpose flour
- 1/3 cup unsweetened cocoa powder
- 1/4 tsp salt
Cookie Base
- 1/2 cup unsalted butter, softened
- 1/2 cup granulated sugar
- 1/4 cup brown sugar, packed
- 1 large egg
- 1 tsp vanilla extract
- 1 1/2 cups all-purpose flour
- 1/2 tsp baking soda
- 1/4 tsp salt
- 1 cup chocolate chips
Marshmallow Filling
- 1 cup mini marshmallows
How-To Steps
Preheat your oven to 350°F (175°C). In a bowl, mix together the granulated sugar, brown sugar, and melted butter until smooth. Stir in the eggs and vanilla, then add the flour, cocoa powder, and salt. Pour this mixture into a greased 8x8 inch baking pan and bake for about 20 minutes. You want them to be a bit underbaked, as they'll firm up while cooling.
While the brownies are cooling, cream together the softened butter, granulated sugar, and brown sugar in a separate bowl until it’s fluffy. Add the egg and vanilla, mixing until smooth. Then, combine the flour, baking soda, and salt in another bowl before gradually adding it to the wet mixture. Stir in the chocolate chips. You can totally taste-test the dough, just remember to save some for the sandwiches.
Once the brownies have cooled, cut them into squares. Take a cookie dough scoop and flatten it out a bit, placing a brownie square and some marshmallows in the center. Then, top it with another flattened scoop of cookie dough. Bake the assembled sandwiches on a baking tray for about 12 minutes at 350°F (175°C). You’ll know they’re done when the edges start to turn golden brown.
Let these sandwiches cool for a few minutes on the baking tray, and then transfer to a wire rack to cool completely. I often break one open to let the marshmallow ooze out a bit before serving – it’s such a fun way to enjoy them!
Extra Tips
- If you find the cookie dough too sticky, add a touch more flour.
- These can be stored in an airtight container for up to a week, though I doubt they'll last that long!
- Try adding nuts or dried fruit to the brownie base for a different twist.
Nutritional Breakdown (Per Serving)
- Calories (kcal): 252
- Total Fat (g): 11.3
- Saturated Fat (g): 5.7
- Cholesterol (mg): 46
- Sodium (mg): 174
- Total Carbohydrates (g): 37.5
- Dietary Fiber (g): 1.2
- Sugars (g): 20.6
- Protein (g): 3.2