Layered Spaghetti Bake Serves 8 to 10. 1 pound ground beef 1/2 cup chopped green bell peppers, chopped 1/2 cup chopped onion 1/2 cup mayonnaise 16 ounce spaghetti sauce 1/4 cup Parmesan cheese 1 (7 ounce) package spaghetti, cooked and drained 1 cup Cheddar cheese, grated Preheat oven to 350 degrees F. Lightly butter a 2-quart casserole dish and set aside. In a skillet over medium heat, brown the ground beef with the chopped pepper and onions. Drain off any excess fat. Add the mayonnaise, spaghetti sauce, and parmesan cheese to the skillet, and cook for another 2 or 3 minutes over a low heat setting to warm the mixture through. Meanwhile, cook the spaghetti, and drain it well. Place half of the cooked spaghetti in the bottom of the prepare casserole dish. Pour half of the meat and sauce mixture over the pasta and sprinkle with half of the grated cheddar cheese. Repeat the process to complete the second, top layer. Bake for 30 minutes. Serve warm with a side salad and garlic or cheesy herb bread.