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Kit Kat S’mores Bars Recipe — Crispy Chocolate Graham Squares

Kit-Kat S’mores Bars combine the classic flavors of s’mores with a crunchy chocolate-covered wafer for an irresistible dessert mash-up.

If you love s’mores flavors, try other easy treats like S’mores Popcorn, S’mores Banana Boats, or S’mOreos for more inspiration.

overhead pile of s'mores bars on plate

Easy S’mores Dessert Bars

S’mores are synonymous with campfires, but you don’t need one to enjoy that toasted-marshmallow goodness. These Kit-Kat S’mores Bars bring the same flavors in an easy-to-make pan dessert you can enjoy year-round. They’re a great way to use leftover candy after holidays like Halloween, and they’re simple enough for a weeknight treat or a party dessert.

The bars combine graham crackers, marshmallows, and plenty of chocolate — plus crushed mini Kit-Kats for extra crunch and flavor.

slab of Kit Kat S'mores bars cut into 9 bars

Ingredients Needed

These bars require only a short list of pantry staples and a couple of candy items. See the recipe card below for exact measurements.

  • Unsalted butter – softened to room temperature.
  • Granulated sugar – for sweetness.
  • Egg – provides structure.
  • Vanilla – for flavor.
  • Graham crackers – crushed to add texture and s’mores flavor.
  • All-purpose flour – spooned and leveled for accuracy.
  • Kosher salt – balances the sweetness.
  • Baking powder – a small lift for the bars.
  • Mini Kit-Kat bars – crushed and scattered over the dough.
  • Mini marshmallows – the classic gooey component.
stack of 3 Kit Kat S'mores bars

How to Make Kit-Kat S’mores Bars

These bars are straightforward to prepare and bake in under an hour. The full recipe card below lists exact measurements and yield.

  1. Prepare the oven and pan. Preheat the oven to 350°F. Line an 8-inch square baking pan with parchment paper, leaving an overhang on two sides for easy removal.
  2. Make the dough. In a large bowl, beat the softened butter and granulated sugar until creamy. Mix in the egg and vanilla. Stir in the crushed graham crackers, flour, salt, and baking powder until just combined. The dough will be sticky.
  3. Assemble the bars. Spray the back of a spatula with nonstick spray and press half the dough into the prepared pan. Evenly sprinkle the crushed mini Kit-Kats over the dough, then the mini marshmallows. Flatten pieces of the remaining dough and gently place them on top of the marshmallows, leaving some marshmallows exposed so the top bakes with a rustic, cobbled look.
  4. Bake and cool. Bake at 350°F for about 25 minutes or until the top is golden brown. Allow the bars to cool completely in the pan before lifting them out with the parchment overhang and cutting into squares.

TIP: Use Parchment Paper

Line the pan with parchment paper to make removal easy. Marshmallows can stick, and the parchment keeps the bars intact when you lift them from the pan.

s'mores dessert bar on parchment paper

Proper Storage

  • Refrigerate. Store cooled bars in an airtight container in the refrigerator for up to 5 days. They’re delicious warm or chilled.
  • Freeze. Cool completely, then freeze in a freezer-safe bag for up to 2 months. Thaw in the refrigerator before serving.
  • Rewarm. If you prefer warm bars, microwave a single piece at 50% power for 5–10 seconds to soften the marshmallow and chocolate slightly.

More Dessert Bars

  • 7 Layer Bars
  • Lemon Bars
  • Apple Pie Bars
  • Snickerdoodle Cookie Bars
  • Praline Crunch Bars

I hope you enjoy these easy, crowd-pleasing Kit-Kat S’mores Bars. If you make them, please leave a review — and feel free to share your tweaks or questions below!

Kit-Kat S’mores Bars

Prep: 15 mins | Cook: 25 mins | Total: 40 mins | Servings: 9 bars
stack of 3 Kit Kat S'mores bars
Kit-Kat S’mores Bars are a delicious s’mores-inspired bar with graham crackers, marshmallows, and crunchy Kit-Kats.

Ingredients

  • 1/2 cup unsalted butter, softened
  • 1/2 cup granulated sugar
  • 1 large egg
  • 1 teaspoon vanilla
  • 5 sheets graham crackers, crushed
  • 3/4 cup all-purpose flour, spooned and leveled
  • 1/4 teaspoon kosher salt
  • 1 teaspoon baking powder
  • 16 mini Kit-Kat bars, crushed
  • 1 cup mini marshmallows

Instructions

  1. Preheat oven to 350°F. Line an 8-inch square pan with parchment paper, leaving an overhang on two sides.
  2. In a large bowl, beat the butter and sugar until smooth, about 2 minutes. Add the egg and vanilla and mix to combine.
  3. Stir in the crushed graham crackers, flour, salt, and baking powder until combined. The dough will be sticky.
  4. Spray the back of a spatula with nonstick spray. Press half the dough evenly into the prepared pan. Sprinkle the crushed Kit-Kats over the dough, then the mini marshmallows. Flatten pieces of remaining dough and place on top, leaving some marshmallows exposed for a rustic top.
  5. Bake about 25 minutes, or until golden brown on top. Cool completely in the pan before using the parchment overhang to lift and cut into bars.

Nutrition

Calories: 324 kcal | Carbohydrates: 41 g | Protein: 4 g | Fat: 16 g | Saturated Fat: 10 g | Sugar: 25 g

Nutrition data is an estimate and may vary depending on specific ingredients used.