S'mores cookies - chinese grandma

Ingredients

• 6 graham cracker sheets (2 crackers per sheet), or about 1 cup coarse graham crumbs
• 1/2 pound (2 sticks) butter, at room temperature
• 3/4 cup granulated sugar
• 3/4 cup firmly packed light brown sugar
• 1 teaspoon pure vanilla extract
• 2 large eggs
• 2 1/4 cups all-purpose flour
• 1 teaspoon baking soda
• 1/2 teaspoon kosher salt (omit if using salted butter)
• 2 cups chocolate chips
• 1 cup mini marshmallows
• 2 1.55 ounce milk chocolate bars (regular Hershey bar size), broken into small half-squares (optional)