A medium-sized onion has 44 calories, 1.2g protein, 10.3g carbs, and 0.1g fat. Onions are a solid source of vitamins C and B6, potassium, and folate.| Verywell Fit
Looking for mushroom nutrition facts and health benefits? One cup of mushrooms contains 15 calories, 2.2g of protein, and 0.2g of fat.| Verywell Fit