The 5 Best Sources of, Plant-Based Protein.br These 5 plant-powered sources of protein won't leave you hungry for more.br 1. Tofu , Tofu is not only rich in protein, br but it also has amino acids that br are vital for tissue repair.br 2. Soy milk , Soy milk has 7 grams br of protein per serving, br while the same portion br of cow’s milk has 8 grams.br 3. Lentils , These legumes have br double the protein of quinoa br and can be made into burgers.br 4. Chia seeds, Just two tablespoons br of chia seeds provide an br impressive 6 grams of protein.br 5.