Garnish toasted marshmallows and chocolate bar pieces before serving. Notes Tip for lining the pan: I usually do 3 graham crackers across and then break off a couple pieces to fill in the gap.

How to Make S’mores Cookie Bars. First, you mix the cookie dough ingredients to form the base. Then, you spread the dough into a baking pan, using a spatula, and bake it in the oven.