preheat oven to 350F
line an 8×8 baking pan with parchment paper
cookie layer:
cream together 1/2 cup softened butter + 1 tsp vanilla + 1/3 cup brown sugar + 1/3 cup granulated sugar
whisk in 1 egg
stir in 1 cup all purpose flour + 1 1/3 cup crushed graham crackers (~12-14 crackers)
press 2/3 of the mixture into the lined dish
break apart 2 chocolate bars of choice (can use dark or milk) and place evenly on top
drizzle 1/3 cup peanut butter on top
warm a 10oz bag of marshmallows + 1/4 cup butter over low-medium heat, stirring frequently
once completely melted add evenly on top
crumble remaining cookie mixture over the marshmallows and bake for 30-33 min or until golden