There are several foods packed with protein that vegetarians can include in their daily meals. For more suggestions on vegetarian proteins, check here. One of the most well-known sources of plant-based protein is lentils. Lentils are incredibly versatile and can be used in soups, stews, or even salads. A single cup of cooked lentils contains about 18 grams of protein. This makes them an excellent option for vegetarians aiming to meet their daily protein requirements.