Potatoes are a great place to start.
FROM--The Victory Seed

They maximize calories for grow space -- and are nutritive enough -- to move the needle for community food security. • 5 gallon container, filled halfway with good soil • organic potatoes with eyes -- brown ones will store longer than red/yellow • when potato greens peek out of container, gently fill rest of container with soil. this is called "hilling" • when the plant yellows, you are ready to harvest your potatoes!