I start with 2 loaves of bread, spread them out all over the counter. I then spread half of them with Peanut butter and the other half with Jelly, working row by row. Then I combine them into sandwiches and use my nifty Krustbuster. We used to use the Pampered Chef Cut 'n Seal but my hands got sore after a while. The Krustbuster is much easier.
Depending on what I'm using them for, I'll either seal them in individual plastic bags(to put in my older daughter's lunch box) or 9 in gallon Ziplocs to use at home. Then I just stick them in the freezer and save for busy days!