My hens get Nutrena country feeds layer crumble. That's what they have been eating since I switched them off of the chick starter long ago, and they love it. I have two feeders that hang about 6 inches off the ground so bugs and mice can't get into it. Also the chickens can't scratch it out.
They also get yogurt, fruits and veggies and garden herbs. They are obsessed with basil. They have a favorite treat from the feed store called Chickie Garden Picnic, that they have been enjoying since they were chicks. It's just a fancy seed and herb mix, they get that maybe once a week. And I save their eggshells, dry them out, and crush them down to offer a calcium supplement if they want that.
Some days I think they might eat better than I do

I love going through the produce while grocery shopping thinking, "what will the girls want this week?"