Soft and Chewy S'more Cookies - Yay! For Food

Ingredients

• ½ cup (4 oz) unsalted butter, softened
• ⅓ cup brown sugar
• 2 tbsp white sugar
• ½ cup crushed graham crackers, divided
• 1 tsp vanilla extract
• 1 large egg
• 1½ cup all purpose flour
• ½ tsp baking soda
• ½ tsp cornstarch
• ½ tsp salt
• ⅔ cup small marshmallows, plus more for topping
• ⅔ cup semi-sweet chocolate chunks, plus more for topping
• 2 graham crackers, broken into pieces