Cook Ingredients for Sauce: Cook the onion, garlic, serrano peppers, and tomatoes for the sauce.
Shred the Chicken Breast: Shred the already cooked chicken breast.
Slice the Onion and Tomato for Garnish: Slice the onion and tomato into rounds for garnishing the enchiladas.
Blend the Sauce Ingredients: Blend the cooked sauce ingredients with cilantro, salt, and chicken broth in two parts due to volume.
Cook the Sauce: Pour the blended sauce into a hot casserole with oil to cook.
Prepare the Enchiladas: Fill the enchiladas with shredded chicken, roll them, and place them in a casserole with a little oil.
Garnish and Serve: Top the enchiladas with the green sauce, cream, cheese, lettuce, tomato slices, and onion. Serve hot.