More on perennials... I have very good luck with garlic. I bought several Music variety bulbs at a local farmstand several years ago. I haven't bought garlic since. Music makes big cloves. Hmmm... bigger than EWOs! Anyway, it's a hardneck variety, and there is another gift: Garlic scapes in June! That's the "hardneck" which is really the flower stalk. You cut that for two reasons, one because it's tasty, and two, the plant sends more energy to the bulb to make bigger cloves.
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If you like rhubarb, that's another fairly easy perennial to grow, but also one that takes 2-3 years to get established.
If you grow potatoes, save the little ones to plant the next year. I haven't bought seed potatoes in 3 years.