This is my dad's version of moussaka. With zuchini instead of eggplant and without any cheese or cream, just with tomato sauce. You can add parmesan to taste to the sauce, though, or, if you want to be dairy free, some nutritional yeast (that's what I sometimes do).
I never measure the amounts, just put together tomatoes, zucchini, potatoes and ground beef, so the amounts are an educated guess.
I'm sure this can be done in a crock pot or in the oven, too, but we always make it on stove top.