In the first year I actually put some Tiny Tim tomatoes in the centre. The second year I changed this and began my herb garden in the centre with some basil and later added other herbs.
Also in the second year I was given a mulch bin to hold my grass clippings. This means I need a much smaller area for my mulching process.
This is an early batch of mulch. You can see it spreads out over a large area
And the next photo shows how I plant the seeds in a row of potting mix in the centre of a growing area
As you can see, I do not have a huge amount of veges growing all the time. This is a hobby for me, not my whole food supply.
I could grow much more if I wanted to put in the time. This type of garden will produce food in relation to the amount of mulch you pile up in the growing areas.
I just keep moving round the circle. When a crop is finished I put down a new lot of mulch in that section and plant seeds again. If I find the weeds have grown in the patch I put down some more newspapers over the weeds before I put in the mulch. Sometimes I allow a few of the plants to go to seed. Then I can either let the seeds fall to the ground and self sow the next crop or I collect the seeds and plant them in rows on the top of new mulch. It all depends on how much mulch is still left after the crop has finished.