S'more Sandwich Cookies Recipe

• 3/4 cup butter, softened
• 1/2 cup sugar
• 1/2 cup packed brown sugar
• 1 egg
• 2 tbsp milk
• 1 tsp vanilla
• 1 1/4 cups flour
• 1 1/4 cups graham cracker crumbs (about 20 squares)
• 1/2 tsp baking soda
• 1/4 tsp salt
• 1/8 tsp ground cinnamon
• 2 cups (12 oz.) semisweet chocolate chips
• 24 to 28 large marshmallows

Directions