If you don't have rotisserie, you can precook 2 chicken breasts. One way is in an Instant Pot or slow cooker. Just add some salt, pepper, garlic powder, and onion powder to give it some flavor first. Or you could cube up some chicken breasts, add seasoning, then saute them in oil for 10-15 minutes or until cooked through. Use the same skillet that you'll use for the rest of the recipe.