Prepare Your Ingredients: Lay out your two slices of bread, peanut butter, and marshmallow fluff on a clean working surface.
Spread the Peanut Butter: Take one slice of bread and spread a generous tablespoon of peanut butter evenly over it.
Add the Marshmallow Fluff: On the other bread slice, spread a tablespoon of marshmallow fluff without holding back—the fluffier, the better!
Combine: Place the slice with the peanut butter on top of the slice with the marshmallow fluff. Press down gently to unite them.
Slice and Serve: Cut your sandwich in half (diagonally or horizontally, your choice!). Enjoy immediately or pack it for later.