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close up side view of chocolate chip cookie bar with peanut butter and marshmallows in it sitting on round cooling rack

Peanut Butter S'mores Chocolate Chip Cookie Bars

Chocolate chip cookie bars loaded with peanut butter, mini marshmallows, graham crackers and milk chocolate bars. These peanut butter s'mores chocolate chip bars are the ultimate dessert!

Course Dessert

Ingredients

  • 1 cup (2 sticks) unsalted butter, room temperature
  • 1 cup granulated sugar
  • 3/4 cup light brown sugar packed
  • 2 eggs
  • 1 tablespoon pure vanilla extract
  • 1 teaspoon salt
  • 1 teaspoon baking soda
  • 3-1/2 cups all purpose flour
  • 2 cups semi-sweet chocolate chips
  • 1 cup creamy peanut butter
  • 1/2 cup graham cracker crumbs (3 graham cracker sheets, crushed, is a very full 1/2 cup, which works just fine for this)
  • 6 (1.55 oz.) size Hershey Milk Chocolate Bars
  • 1-1/2 cups mini marshmallows

Instructions

  1. Preheat oven to 350ºF.

  2. Lightly grease a glass 9x13 baking pan.
  3. In a stand mixer, beat the butter and sugars until light and fluffy.
  4. Add eggs and vanilla, continue to beat until combined.
  5. Add in the salt and baking soda, beating until mixed in.
  6. Gradually add in the flour, then the chocolate chips.
  7. Divide the cookie dough in half. Press half of the cookie dough into the bottom of the prepared pan.

  8. Spread peanut butter over the top of dough (use an off-set spatula for easier spreading).

  9. Top peanut butter with crushed graham cracker crumbs.

  10. Layer the 6 chocolate bars over graham cracker crumbs (I broke mine into pieces and then placed them on).

  11. Spread mini marshmallows in an even layer over the chocolate bars.

  12. Place remaining dough on top – I did this in pieces, flattening out small pieces in my hand and setting them on. The pieces can touch, but don’t have to, the dough will spread as it bakes. (see photos above)

  13. Bake for 22-27 minutes or until the top is golden brown. (Check at 22 minutes. The dough should be mostly set when you give the pan a jiggle. If it needs longer, but the top is golden, cover with foil for the last few minutes to keep the top from browning too much).

  14. Allow to cool, then cut into bars!