I found a recipe for Spaghetti Pizza Casserole that looked good. I just called it Spaghetti Pie. It was okay. I've made this from leftovers before and it was just as good. Just take leftover spaghetti noodles, mix in bowl with an egg or two and 1/4 cup of parmesan cheese. Spread mixture in a 8x13x1" pan. Top with your choice of spaghetti sauce, mushrooms and mozzarella cheese. Bake about 30 minutes at 350. Enjoy!