Oh I gave up tilling years ago. I move the mulch, grass and leaves, I had on the bed for the winter. Something I dig a shallow hole with a hand trowel, this year a hoe. Put potatoes a ft apart. Hoe some dirt over, cover whole bed with the grass and leaves. Put a soaker hose down. Later Cover the whole thing with used straw. During the year I will probably have to put down more straw so I don't have green potatoes. Minimal weeding needed.Good luck. I'm young and MY back hurts after doing potatoes. This year I tilled, raked the dirt too one side, set the potatoes in and then covered them with using a shovel.
I used to till, mound the dirt, and then plant in individual holes - that is too much kneeling, crawling and digging.
Onions get planted through a sheet of some kind of organic 4ft wide paper to keep weeds down. Mulching didn't work as well.