This recipe was given to me by my sister, who had come across it somewhere. I have changed it to be heart healthier by reducing the cheese and increasing the veggies. You can also add sliced mushrooms, and most any kind of fresh vegetable, such as cauliflower. I serve it over egg noodles, drizzled with the juices, or with rice pilaf. It's a complete meal and is very tasty and satisfying. Sometimes I use mild cheddar, sometimes sharp, depending on what is in the fridge. You can also replace the mozzarella with another white shredded cheese, but I have found that the texture is better if you use the mozzarella.