Name: Oatmeal Cookie S’mores Bars
Prep time: 10 min
Cook time: 18 min
Total time: 28 min
Cuisine: American
Ingredients: 1 1/2 cups rolled oats; 3/4 cup oat flour; 1/2 tsp baking soda; 1/2 tsp salt; 1/3 cup coconut sugar or brown sugar; 1/2 cup peanut butter (or almond butter); 1/4 cup pure maple syrup; 1/4 cup coconut oil, melted (or butter); 1 tsp pure vanilla extract; 1/2 cup dairy-free chocolate chips; 3/4 cup mini marshmallows (vegan if desired)

Gooey, nostalgic, and satisfyingly chewy—these Oatmeal Cookie S’mores Bars bring all the classic campfire flavors indoors. With layers of rich chocolate, golden marshmallows, and a wholesome oatmeal cookie crust, I find these bars to be the perfect combination of cozy and indulgent. Whether I’m baking for a summer gathering or just need a quick dessert fix, this recipe never disappoints.

Why You’ll Love This Recipe

I love how this recipe takes the essence of traditional s’mores and transforms it into an easy-to-bake dessert bar. There’s no need for an open flame or sticky fingers—just a few simple steps and one pan. It’s also naturally sweetened, gluten-free optional, and perfect for anyone looking for a treat that’s both wholesome and satisfying. The combination of hearty oats, creamy nut butter, and gooey toppings hits all the right notes.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

1 1/2 cups rolled oats

3/4 cup oat flour

1/2 tsp baking soda

1/2 tsp salt

1/3 cup coconut sugar or brown sugar

1/2 cup peanut butter (or almond butter)

1/4 cup pure maple syrup

1/4 cup coconut oil, melted (or butter)

1 tsp pure vanilla extract

1/2 cup dairy-free chocolate chips

3/4 cup mini marshmallows (vegan if desired)

Directions

I start by preheating the oven to 350°F (175°C) and lining an 8-inch baking pan with parchment paper.

In a large bowl, I mix together the rolled oats, oat flour, baking soda, salt, and coconut sugar.

Then I stir in the peanut butter, maple syrup, melted coconut oil, and vanilla extract until everything is well combined.

I press two-thirds of this oat mixture into the bottom of the prepared pan to create the crust.

After that, I sprinkle the chocolate chips and marshmallows evenly over the crust.

I crumble the remaining oat mixture over the top and gently press it down to hold everything together.

It bakes for 15–18 minutes until the top is golden brown and the marshmallows are just toasted.

I let it cool completely before slicing into bars, which really helps with the texture.

Servings and timing

Servings: 12 bars

Prep Time: 10 minutes

Cooking Time: 18 minutes

Total Time: 28 minutes

Calories: 210 kcal per bar

Variations

I sometimes swap out the peanut butter for almond or cashew butter for a different flavor twist.

For extra indulgence, I add a handful of crushed graham crackers or chopped nuts to the oat mixture.

If I want a stronger chocolate flavor, I use dark chocolate chunks instead of chips.

For a nut-free version, I use sunflower seed butter.

Storage/Reheating

I store the bars in an airtight container at room temperature for up to 3 days, or refrigerate them for up to a week. They also freeze well—I wrap each bar individually and freeze for up to 2 months. When I want to reheat them, a few seconds in the microwave brings back the gooey texture.

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FAQs

How can I make these bars gluten-free?

I make them gluten-free by ensuring that the rolled oats and oat flour are certified gluten-free.

Can I use regular chocolate chips and marshmallows?

Yes, I often use whatever I have on hand—just be aware that standard versions may contain dairy or gelatin if you’re keeping it vegan.

Do these bars hold together well?

They do, especially after cooling completely. I always let them sit before slicing for the best results.

Can I use honey instead of maple syrup?

Technically yes, but I prefer maple syrup for its smooth texture and because it’s vegan-friendly.

What’s the best way to cut them cleanly?

I use a sharp knife and clean it between cuts. Chilling the bars slightly also helps me get neater edges.

Conclusion

These Oatmeal Cookie S’mores Bars are everything I love in a dessert—easy, comforting, and packed with flavor. They’re ideal for sharing, storing, or sneaking one as a late-night treat. Whether I’m reminiscing about campfire nights or just craving something sweet, this recipe always delivers.

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