Trouble With Cats

Our new veggie garden is growing well, but for one problem CATS
I do love cats and appreciate their help with keeping rats and mice away.
But after planting some carrot and spring onion seeds, and having a cat dig up the soil (through the night). My poor seeds and soil is in a mess.

I had planted the carrots and spring onions in front of the chicken tractor.

So how to keep cats off our veggie garden?

We have another raised garden bed, with our colourful chard is planted. Have had no problems with cats with that bed. Wonder if it is the mulch we used? If it is the mulch, then after we add it to this garden we should have no more problems with cats.
But will have to investigate other ways to ensure cats don't go on our veggie garden.