This Low Calorie Bagel Sandwich is just 375 calories all thanks to my low calorie bagel recipe. It requires just 2 ingredients and no rising time. It's also packed with 43.9g of protein! You can use your favorite cheese and choose your own spread. If you like mayo and mustard I recommend the Club Sandwich Sauce for a low calorie option. Special Tip: If you don't want to make your own bagels, you can purchase store-bought bagels. Cut in half and hollow out the centers. This will save you 1/3 the calories and carbs.