most efficient garden?

I'm not a gardener,but I've played around with it.Had some success and failures,but I just don't enjoy it.So this is mainley hypothetical,but it never hurts to learn/ask.
L'm in SWFL,so location matters,but what 3-5 veggies give you the most return for the least effort?
I would pick potatoes as #1.They can store well,prepared so many ways,filling and full of carbs and vitamins.
#2 is onions.
#3 is carrotts.
seems like root veggies are the way to go?

I know there are a lot of variable,but what veggies give you the most bang for your buck$?

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most efficient garden?