I found this recipe on a can of Del Monte spinach. I used fresh spinach instead of the can, chicken instead of beef. It turned out to be a big lasagna, but it was very good. I made it in a 4.5 quart casserole dish. It seems like you could substitute and add a lot of things. I added some zucchini to the chicken. I also used low-fat ricotta and low-fat mozzarella.