Always keep frozen vegetables in your freezer, that way when you're hungry for a "snack" you can be eating in minutes AND getting 1, 2 or more of your vegetable servings taken care of at the same time! It's a delicious and satisfying snack with astoundingly few calories, even with a bit of butter added! Cauliflower and baby brussel sprouts are my personal favourites.
Particularly great in the fall and winter when we tend to crave warm food. For a bit of decadence, sprinkle on some parmesan cheese or crumble a bit of lite feta cheese.