Peanut Butter S'mores Bars

9 bars
40 min

As summer is wrapping up, school is starting and everyone is settling in to their routines. There is less time for backyard BBQs and bonfires. One of my favorite summer activities is sitting by the crackling fire with my friends and family roasting marshmallows. While I welcome the cooler weather, I definitely still crave those gooey, chocolaty s’mores. These peanut butter s’mores bars are the perfect afternoon pick me up. They bring me back to those lazy summer days all without the hassle of making a fire!

I’m one of those people that puts a Reeses peanut butter cup in my s’mores instead of Hershey’s chocolate. I love the salty peanut butter with the gooey marshmallow and crunchy graham cracker! That’s why I love these s’mores bars. There is LOTS of peanut butter along with all the traditional ingredients!

Peanut Butter S'mores Bars
Recipe details
  • 9  bars
  • Prep time: 10 Minutes Cook time: 30 Minutes Total time: 40 min
Show Nutrition Info
Hide Nutrition Info

  • 1/2 cup butter (room temperature)
  • 1/2 cup peanut butter
  • 1/2 cup granulated sugar
  • 1/4 cup brown sugar
  • 1 egg (room temperature)
  • 1 tsp vanilla extract
  • 1 1/3 cup all purpose flour
  • 6 graham crackers sheets
  • 1 tsp baking powder
  • 1/4 tsp kosher salt
  • 4 oz chopped chocolate bar (milk or dark)
  • 7 oz jar marshmallow fluff

Preheat oven to 350°. Grease an 8x8 baking dish or line with parchment paper.
n a bowl of a stand mixer fitted with the paddle attachment, cream together the butter and ¼ cup peanut butter until smooth. Add in both sugars and mix until light and fluffy. Add in the egg and vanilla. Mix.
Using a rolling pin, crush the graham crackers in a ziploc bag. In a separate bowl, whisk together the flour, graham cracker crumbs, baking powder and salt. Add the dry ingredients into the wet ingredients. Mix until just incorporated.
Press half of the dough into the baking dish. Spread the other ¼ cup peanut butter onto the dough. Evenly sprinkle the chopped chocolate. Microwave the marshmallow fluff for 20 seconds. This makes it easier to spread. Keep an eye on it so it doesn't overflow. Spread the fluff on top of the chocolate. Press the rest of the dough on top of the fluff. Try to cover the fluff entirely, but it's ok if there is still some fluff sticking out.
Bake for 28-32 minutes until the top is golden brown. Let cool for 10 minutes. Remove from the pan and let cool on a cooling rack. Let cool completely before cutting into 9 bars or they will be a gooey mess! However, if you don't care about cutting them into pretty bars, dig into them right away. They are incredible hot out of the oven!!
Sav | Lagom Eats
Want more details about this and other recipes? Check out more here!
  • Lisa Lisa on Sep 13, 2020

    Love the idea of adding peanut butter, but HATED the extra butter, sugar and flour. But I followed the recipe, tried one bite and threw the batch out. These were NOT S'Mores. These are WAY too sweet.

    I then followed the traditional method, adding peanut butter to one graham cracker square, before the chocolate and toasted masrshmallow. Easier, less caloric, not over the top sweet.

    • See 1 previous
    • Sav | Lagom Eats Sav | Lagom Eats on Sep 14, 2020

      I'm so sorry you didn't like them! They are s'mores bars so basically a cookie (in bar form) with all the s'mores ingredients. They are very sweet and rich!

      You could reduce the amount of sugar in the cookie dough if you like them less sweet or add coconut sugar 1:1 instead. As far as the butter goes, you could use coconut oil instead.

      These are most definitely not health food so yes, they are full of sugar and calories. They are a treat yo' self kind of dessert :)