Preheat oven to 350 degrees F.
In a large mixing bowl, combine brown sugar, melted butter, eggs and vanilla and mix together.
Add the flour, crushed graham crackers, baking powder, and salt into the bowl and mix until blended.
Gently fold in the chopped Hershey bars, mini marshmallows, and white chocolate chips.
Using a large cookie or ice cream scoop make dough balls. Place them on a baking sheet lined with parchment paper.
Place cookies 2 inches apart on sheet as they will spread.
Bake the cookies for 8-10 minutes.
Let cookies cool on cookie sheet for 5-10 minutes before transferring to a wire rack to finish cooling.