Protein + Fiber in a calorie-friendly bar Quest bars are my go-to protein bars. They have the most protein and fiber for the least amount of calories, compared to dozens of other protein bars I've tried. My favorite is Chocolate Brownie (180 calories, 20 g protein, 17 g fiber). I also love Chocolate Chip Cookie Dough 200 calories, 21 g protein, 14 g fiber). Nearly every flavor I've tried is delicious, though.