"Sausage and butternut squash has been one of my favorite combinations for a long time. Usually when I pair the two it is in a simple hash, but lately I have been making lots of these egg casseroles to have for breakfast during the week and my beloved squash and sausage is the perfect combination. Not only is it packed with protein, it's also extremely filling and will keep you going all morning. I like to add spinach to mine for some greens as well as red onion. You could also add bell peppers, mushrooms, and no one would blame you if you threw some cheese on top...."