T.,
I recommend you don't go down this road. Make ONE thing for him to eat, not: "You don't want this? Here, let me make you something else. Oh, you don't want this either, well, how 'bout I make you this instead...etc." If he doesn't want what you've made for him, then he doesn't eat.
He will eat when he gets hungry enough.
You can make a variety of foods throughout the week so he has the opportunity to try new things, but don't allow him to decide that there is only one thing he's going to eat. Just because he wants PB&J all the time because he likes it, doesn't mean it's healthy for him to only eat that.
From here forward, I recommend NO PB&J--at all, for as long as it takes--a week, a month, a year, to get him eating a variety of foods.
There is an L.A. mom I met recently who has indulged her son since he was a toddler with his "picky" eating and she still does it. The kid is 9 years old (will be 10 in a few weeks) and refuses to eat anything but white bread, carrots, and drink milk. No fruit, no other vegetables. No meat (he insists he's a vegetarian). The kid looks like hell--gaunt and pale. And compared to the other kids, he's undersize for his age. When I first met him, I thought he was seven or eight years old. She gives him vitamins, but he's tired and surly all the time.
We met at a mutual friend's house for dinner so their kids could play and we could have some girl time (my son is much older). It was the most frustrating thing to watch this boy manipulate his mother by insisting on bread only and telling her that if she didn't give it to him, he wouldn't eat at all. I turned around to the kid and said, "If you were my son, you'd eat what I tell you to, or you'd be one hungry little boy."
The mother was completely beside herself and kept asking me what she should do because she knows it's not healthy for him, but she's more afraid of him not eating at all. I said that although it might be inconvenient for the rest of her family (she has a husband and a younger daughter who eats whatever the mother makes), she should stop buying bread and milk and just not keep it in the house until her son starts eating other foods.
By the way, the mother told me her son's school called social services because she was only sending milk money and a bag of bread with him for lunch (because the boy insists he only eats carrots at night). The mother has also taken him to a nutritionist, but that lady said until the mother can get him to eat other foods, she can't do anything to help get him back to being healthy. The mother is considering having her son admitted into the hospital for forced tubal feeding, but she really doesn't have the money for it. Personally, I don't think that will help anything, because it doesn't solve the problem.
Anyway, I know this is a very long response, but I wanted you to see what can happen in the future if you don't stop it now. It will be a lot harder to deal with when your son gets older.
Good luck.