In a large bowl, combine butter and brown sugar
Using a hand mixer, mix until light and fluffy, about 3 minutes. Scrape the sides of a bowl with a nonstick spatula
In a separate medium bowl, combine all dry ingredients including the graham cracker crumbs. Mix with a fork to combine. Set aside
Add in egg and mix again until combined
Add in all dry ingredients and mix until thick dough forms
Cover bowl with cling wrap or a lid and refrigerate for at least 2 hours
When you are ready to bake the cookies, preheat the oven to 350F
Line a cookie sheet with parchment paper and prepare a clean work surface
Using a medium cookie scoop (2.5 tablespoons) scoop dough into the cup of the scoop. Use your fingers to create a divot in the dough and then spoon in 1/2 tablespoon-1 tablespoon of fluff. How much fluff you use is up to you. Do not put over 1.5 tablespoons
Place cookie with rounded side down on sheet and exposed fluff side facing up
Top with pieces of chopped chocolate and bake for at least 8 minutes. The cookies should appear set but slightly underdone in the middle
Let cool and enjoy!
Optional: Top with teddy grahams!