Lightly butter your baking dish.

Combine 5 cups Rice Krispies and 1 cup of Oreos.

Combine butter, peanut butter, and marshmallows in microwave safe bowl. Microwave in 15 second intervals until melted. Stir well.

Pour your marshmallow mix into your Rice Krispie mix, and stir well again.

Scoop the mixture into your buttered dish and press down until your Rice Krispies are spread evenly.

Refrigerate for an hour, then cut and enjoy!