In a large bowl, cream together butter and both sugars.
Add egg and vanilla and mix all ingredients together.
In a separate bowl, sift together flour, baking soda and salt.
Slowly add dry ingredients into the egg mixture (ie.: wet ingredients). Mix together until cookie dough forms.
Use a spatula to fold the chocolate chips into the cookie dough.
Wrap cookie dough in plastic and refrigerate for at least 30 minutes (or more!)
Once the time is up, remove from the fridge and preheat oven to 350 degrees F.
Line a baking sheet with parchment paper.
Fill out a cupcake scoop (about 3 tbsp in size) half way with cookie dough. Press in about 3 marshmallows and top off with more cookie dough.
Remove from the scoop and form into a sphere. Roll into graham crackers and add to lined baking sheet, keeping them about 1-2 inches apart.
Bake for 11-13 minutes.
Allow to cool on a rack - serve and enjoy.