1 - Get two slices of plain white bread (or wheat or whatever bread you like, honestly. I think peanut butter and jelly goes best with white bread, though) and lay them on a preparation surface.
2 - Retrieve your peanut butter and your jelly from the fridge, open the jars. Place them next to your preparation surface.
3 - Spread a layer of peanut butter on both pieces of the bread, using a knife. Follow this with a layer of jelly.
4 - Put the slices together so the filling is between the slices.