Preheat oven to 375 degrees. Lightly butter a jelly roll pan (10x15); may substitute a 9x13 pan.
Beat together butter, brown sugar and white sugar; add eggs and vanilla, beat. Stir in flour, graham cracker crumbs, baking soda and salt. Press half the cookie dough in the bottom of prepared pan (note- a little flour on your hands will help keep dough from sticking to fingers). Drop marshmallow crème by spoonful onto cookie crust; sprinkle with chocolate chips. Crumble remaining cookie dough over top of marshmallow and chocolate chips. Bake 18-23 minutes or until golden brown and cooked in center (note - if using 9x13 pan, bake 25-30 minutes).
Notes: Recipe is a slight modification of the classic "Nestle Toll House Cookie" recipe from the back of chocolate chip package. Recipe makes one 10x15 pan (jelly roll pan) or 4 dozen bars.
This is a great treat to take on picnics. S'Mores may be warmed on the top of a low temperature barbecue grill. Don't forget cold milk to go with them.
From the Harmon Family Recipe Collection Printed: January 1, 2026