Take regular bagged popcorn to the next level by topping with 2 tablespoons of shredded Parmesan cheese. The nutty flavor of the popcorn pairs well with the rich flavor of Parmesan resulting in a quick, 150-calorie snack. Simply top 3½ cups of 94%-fat-free popcorn with the cheese and your snack is served. If you don't have an office fridge to stash your Parm, nosh on just the popcorn for only 100 calories. This salty snack counts as one of your three daily servings of whole grains and helps to increase your energy and mood.