You can gain muscle by ingesting egg white, and the protein content of chicken breast is about 20%
That is, you probably need to consume 120g of protein a day, so you eat 10 egg whites, and one * * * is 40g.
Then there are 80 grams left, and you are eating 400 grams of chicken breast, so you have enough protein for one day.
You can also drink some milk and supplement some from protein.