Slice your four Rice Krispie Treats in half lengthwise and then lay flat on a plate or cookie sheet and then set aside.

Mix your frozen whipped topping and peanut butter in a bowl until smooth and equally combined. Press hard with your spoon to break up any of the frozen pieces of the topping. Set aside.

In a microwave safe bowl, combine marshmallows, butter, and milk. Microwave for 30 seconds. Remove from microwave and stir well. Marshmallows will come out all puffed up, but will deflate and be stirrable in a few seconds.

Stir a heaping tbsp. of peanut butter mixture on one half of the RIce Krispie Treat and a tbsp. of marshmallow creme on the other half. Layer with either type of M&M if desired and then put one piece on top of the other to form your sandwich. Enjoy!