A Stick of String Cheese
A stick of part-skin string cheese offers 80 calories and has an impressive 8 grams of protein. It also provides a high amount of calcium without high-fat content as compared to other cheese variants. It is a more accessible, affordable, and on-the-go snack.
Additionally, string cheese is appropriately portioned, so you would not overeat. Only keep one single stick near you in order to stick to your 100 calorie snack.