Don't feel weird. They are your animals and you can do whatever you want. However, there has been well over 100 years of research into poultry nutrition. After all that time, we now know exactly which of the 40+ nutrients chickens of all ages are known to need and in which ratios. For chicks, those nutrients are in chick starter feed in the exact amounts they need. A good quality FRESH feed is the best thing you can do for their health. Much more important than the urge to vary their diet is to make sure the feed is fresh. Always check the mill date on the bag because some feed stores don't rotate their feed. I've seen feed up to 2 years old at feed stores and I wouldn't feed any more than 2 months old if I can help it. That old feed will have lost most of its vitamin content, a lot of the amino acids and the fats may have become rancid.
If you feed anything else, you will upset the balance and possibly, to the chicks' detriment. You said they are doing really well. If it ain't broke, don't fix it.
To carry it a step further, chickens are not vegetarians, they are omnivores. Treating with vegetables will lower the protein intake. Adult chickens in a free range situation don't make vegetation a huge portion of their daily intake. It is mostly seeds, insects, other invertebrates and vertebrates including mice and frogs. If they encounter a dead deer carcass in their foraging, they may eat some. Do you have any finely chopped steak or fish to give them after adding grit to the diet? That would be better than vegetables and fruit.
Are you currently giving them chick grit? If not, it would be a good idea to start. If you feed anything except starter feed, grit will be absolutely essential and preferably before their first bite of a vegetable or anything else that isn't finely ground. Chickens don't have hands or teeth. To digest their feed, they rely on the food to be ground in the gizzard which requires small sharp insoluble stones.
I feed mine a mix of cooked, mashed egg with a little bit of the shell finely cracked over, some fine cut rolled oats and finely cut stinging nettle. I also cut in some chives and some very fine grated carrots. Then I drizzle some dried oregano over. They also enjoy some fine cut dandelion leaves or tiny mealworms.
Hens go broody when you don’t want them to… and won’t go broody when you do. 
