We recently had some stale crackers. Just plain old soda crackers destined for soup. Edible, but not tasty.
My husband fixed them up in a jiffy by applying a little heat via the oven. I don't even know what temperature or how long, but it wasn't particularly super-hot and it didn't take very long at all.
Wow! What a difference. They were so much better than even not stale crackers. Even the kids noticed the difference. It was a big hit.
Try it sometime if you have a few spare minutes or just feel like making things seem a little fancier for your kids (if plain old soda crackers can be fancy).