I eat a lot of fruit when it is in season (watermelon - I could live on it, peaches, strawberries, other melons, grapes).
I like crackers too.
Puppy chow (Crispix, peanut butter, chocolate, etc) is yummy, not the healthiest I suppose, but soooo yummy.
I love homemade bread just to snack on.
Quickbreads like zucchini bread, banana bread, rhubarb bread, etc.
Cookies, cobblers....
I've made myself hungry.
ED: I just went back and see the nutritious part of your request...OOPS! I guess some of the snacks fit though right...hehehe! My mind is on sweets right now....