Molting chickens need lots of protein since the feathers they are losing take up 85% protein. Some of the best foods to give are: oatmeal, scrambled or hard boiled eggs, quinoa, meat scraps, peas, black oil sunflower seeds, corn, dry dog food or cat food, tuna fish or soybean meal. Here's an article explaining further. https://www.backyardchickens.com/a/what-happens-when-chickens-molt