Gently open the oreo cookies, scrape off the peanut butter filling and set aside.
Place the remaining chocolate cookies in a plastic bag, take a rolling pin and gently smash the cookies in the bag until they are fully crumbled.
Empty the crumbled cookies into a mixing bowl, pour in the melted butter, and stir together to moisten the cookies.
Divide the cookie mixture between 4 ramekins (or any small dishes or glasses).
Next place the light cream cheese in a mixing bowl, add the peanut butter filling. Using a hand whisk, mix until fully combined.
Divide the cream filling evenly between the 4 ramekins.
Add a tbsp of chocolate chips and top with 4 marshmallows (or a tbsp of mini marshmallows).
Place under the grill for up to 5 minutes, or until the marshmallows have melted and are lightly browned.