What are some healthy snacks that are good to eat when dieting?

I usually like snacks with a crunchy texture, like sweet chocolate or sweet potato sticks.

I tend to buy and eat that kind of snack often.
Of course, I know it's bad for my health, but I love snacking so much that it's really hard to quit all at once.
So I'm looking for a healthy snack to replace cookies, but it's not easy.
Of course, I eat a little bit of nuts whenever I crave a snack, but that isn't enough to satisfy me, so I'm worried.