5 High-Protein Vegetables That Will Fill You up Quickly 1. Peas Peas are loaded with vitamin A and contain 4g of protein per half cup. 2. Spinach Loaded with vitamin C, folic acid and other B vitamins, spinach provides a huge amount of protein when cooked. 3. Baked potato A medium-sized baked potato contains 3g of protein, tons of vitamin C, potassium and some filling fiber. 4. Brussels sprouts These little veggies are a great source of potassium, vitamin A, vitamin K
and fiber. 5. Lima beans The combination of high fiber and high protein make these legumes a satiating nutrient-filled powerhouse.