Craving the perfect blend of cozy comfort and indulgent sweetness? These S’mores Oatmeal Crumble Bars are the answer! With layers of toasted oats, gooey marshmallows, rich chocolate, and a hint of graham cracker crunch, this dessert brings all the classic flavors of a campfire favorite into an irresistible bar form. Whether you're baking for a family treat or a crowd-pleasing snack, these bars are sure to become a go-to recipe for any occasion.
Course Dessert
Keyword oatmeal, smores
Prep Time 10 minutesmins
Cook Time 3 minutesmins
Cool Time 1 hourhr
Total Time 1 hourhr13 minutesmins
Servings 12
Equipment
9X13 Baking Dish
Ingredients
For The Crust
1stickButtermelted
2sleevesGraham Crackers
1/3cupBrown Sugar
For The Chocolate Middle
3cupSemi-Sweet Chocolatemelted
14ozSweetened Condensed Milk
3tbsp.Buttermelted
1tsp.Vanilla Extract
For The Oatmeal Crumble
2cupsMini Marshmellowssplit in half
1cupOats
3/4cupFlour
3/4cupBrown Sugar
1/2tsp.Cinnamon
1/2tsp.Salt
5tbsp.Buttermelted
Instructions
For The Crust
In a food processor, combine crushed graham crackers, melted butter, and brown sugar. Mix everything together until the mixture is well-combined and resembles wet sand.
1 stick Butter, 2 sleeves Graham Crackers, 1/3 cup Brown Sugar
Press this mixture into the bottom of a greased baking dish to form an even layer.
For The Chocolate Layer
In a microwave-safe bowl, combine the semi-sweet chocolate, sweetened condensed milk, butter, and vanilla. Microwave the mixture in 30-second intervals, stirring between each, until everything is fully melted and smooth.
3 cup Semi-Sweet Chocolate, 14 oz Sweetened Condensed Milk, 3 tbsp. Butter, 1 tsp. Vanilla Extract
Once the chocolate mixture is ready, pour it over the graham cracker crust and spread it evenly. Refrigerate the bars for at least 1 hour to allow the chocolate to set and firm up.
For The Oatmeal Crumble
After the chocolate has chilled, top the bars with 1/2 of the mini marshmallows, spreading them evenly across the surface.
2 cups Mini Marshmellows
Now, make the oat crumble by combining oats, flour, brown sugar, cinnamon, salt, and melted butter in a bowl.
1 cup Oats, 3/4 cup Flour, 3/4 cup Brown Sugar, 1/2 tsp. Cinnamon, 1/2 tsp. Salt, 5 tbsp. Butter
Mix until the crumble is evenly coated and forms small clumps. Sprinkle this oat crumble mixture evenly over the marshmallows & adding the rest of the mini marshmallows on top.
2 cups Mini Marshmellows
Place the baking dish under the broiler for 2-3 minutes, keeping a close eye on it, until the marshmallows are golden and the oat crumble is slightly toasted. Remove from the oven, let the bars cool, and then refrigerate again if needed. Slice into bars and enjoy this gooey, decadent treat!
Notes
Storage Tips For This Recipe
Room Temperature: Store the bars in an airtight container at room temperature for up to 2-3 days. This will keep them fresh and soft, with the marshmallows retaining their gooey texture.
Refrigeration: If you want to extend the shelf life, refrigerate the bars in an airtight container for up to 1 week. Chilling them also helps keep the chocolate and marshmallow layers firm.
Freezing: For longer storage, these bars freeze beautifully. Wrap individual bars tightly in plastic wrap or foil, then place them in a freezer-safe container or zip-top bag. They can be stored in the freezer for up to 2-3 months. To thaw, let them sit at room temperature for 20-30 minutes or microwave them for a few seconds.
Preventing Sticky Marshmallows: If you’re storing the bars with marshmallows on top, it's helpful to place a sheet of parchment paper between layers of bars in the container to prevent the marshmallows from sticking to each other.
Common FAQ's Related to This Recipe
Can I use a different type of chocolate? Yes! You can swap the semi-sweet chocolate for milk chocolate, dark chocolate, or white chocolate, depending on your preference.
Can I use a different type of sugar in the crumble topping? You can substitute brown sugar with white sugar, although brown sugar adds a richer flavor. Other sweeteners like coconut sugar may alter the texture slightly.
Can I freeze these bars? Yes, wrap the bars individually in plastic wrap or foil and store in a freezer-safe container for up to 2-3 months. Thaw at room temperature or microwave to enjoy later.
What’s the best way to cut the bars after chilling? Use a sharp knife dipped in hot water before each slice. Wipe the knife after each cut to maintain clean edges, especially with marshmallows on top.
Can I use regular marshmallows instead of mini marshmallows? Yes! You can use regular-sized marshmallows, but cut them in half or quarters to help them spread more evenly. Mini marshmallows are preferred for even melting and distribution.