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Oatmeal Cookie S'mores Bars

Chewy oat cookie base layered with marshmallow creme and dotted with chocolate chips—like s’mores meets oatmeal bar, all baked in one square pan.
Print Recipe
Prep Time 15 minutes
Cook Time 30 minutes
Cooling Time 1 hour
Total Time 1 hour 45 minutes
Servings 12

Ingredients
  

  • ½ cup unsalted butter softened
  • 1 cup packed brown sugar
  • 1 egg
  • 1 teaspoon vanilla extract
  • ½ teaspoon baking soda
  • ½ teaspoon salt
  • 1¼ cups all‑purpose flour
  • 1½ cups quick‑cooking oats
  • 1 7 oz jar marshmallow creme
  • 1 cup chocolate chips milk or semi‑sweet

Instructions
 

  • Preheat oven to 350°F. Line a 9×9″ square pan with foil and spray with nonstick spray.
  • Cream butter and brown sugar until smooth.
  • Beat in egg, vanilla, baking soda, and salt.
  • Mix in flour, then slowly incorporate oats.
  • Press half the dough into bottom of prepared pan (oiling your hands helps with stickiness).
  • Microwave marshmallow creme 10–20 sec until soft and spreadable. Spread over bottom dough, leaving a narrow border at edges.
  • Sprinkle chocolate chips over marshmallow layer.
  • Scoop remaining dough and flatten pieces to cover top, filling gaps.
  • Bake 23–28 minutes until top is golden and firm around edges (center may jiggle).
  • Cool completely before slicing (the middle will be gooey when warm).
  • Store in airtight container up to 4 days.

Notes

  • Spray your fingers or spoons when handling sticky dough.
  • Don’t overbake—the goal is a slight jiggle in center.
  • Cool thoroughly so the bars firm up before slicing.
  • Use quality chocolate chips for better melt.
  • Line pan with foil so you can lift bars out cleanly.