Freshly baked layers of cookie dough, marshmallows, and peppermint bark make Chocolate Peppermint S’mores Bars a holiday treat you’ll want to keep around long after the season ends.
Preheat the oven to 350 degrees Fahrenheit (175 degrees Celsius). Line a 9×13 or quarter baking sheet with parchment paper. Use the chocolate graham crackers to cover the parchment, then set aside.
In the bowl of a stand mixer, beat together the butter, sugars, vanilla, and peppermint for 2–3 minutes. Add the melted chocolate chips and mix until combined. Add the egg, and then the egg yolk, mixing just until combined.
In a medium-sized mixing bowl, whisk together the flour, cocoa powder, baking soda, and salt. With the mixing speed on low, add the dry ingredients. When no flour pockets remain, turn off and remove the bowl from the stand. Spread the cookie dough over the graham crackers in an even layer.
Place in the oven and bake for 6 minutes. Remove and gently press in the remaining graham crackers (broken into pieces), marshmallows, chocolate chips, and baking bar pieces. Return to the oven and bake for an additional 10–12 minutes, or until the marshmallows become lightly golden in color. Remove and allow to cool in the pan for 25–30 minutes before removing and cutting into bars.
Notes
STORE these Chocolate Peppermint Marshmallow Bars in an airtight container at room temperature for up to 4 days. To FREEZE, layer them between sheets of parchment in a freezer-safe container and store them for up to 2 months.Thaw in the fridge overnight or leave on the counter for a few hours. If you want that gooey texture back, REHEAT them in the oven at 300 degrees Fahrenheit (150 degrees Celsius) for 5–7 minutes or microwave for about 10–15 seconds.