Not all PB&J sandwiches were created nutritionally equal. It all depends on the quality of the ingredients that you use.
If you use white bread, corn syrup-filled peanut butter and refined sugar-filled jelly, the result would be a sandwich that will skyrocket your blood sugar, promotes fat storage and leaves you feeling hungry a short time later.
However, if you make this recipe, with wholegrain or rye bread, true peanut butter made from one ingredient: peanuts, and fruit preserves that are naturally sweetened with fruit juice rather than sugar, then the result would be a nutritionally dense food that would promote stable blood sugar levels and provide you with hours of sustained energy.
Your kids will love the fun twist of having their sandwich grilled and stuffed with banana slices!