1. Halve and seed squash and place cut-side down in baking dish. Add 1/4 inch water to dish, cover and bake in a 400 degree oven for 35 minutes or until tender. Scoop out squash and mash with garlic, 1/4 cup romano cheese, bread crumbs, and nutmeg. Add salt and pepper to taste.
2. Turn onions into a large skillet and sauté for 15 minutes in oil until tender and golden. Boil noodles as package directs; drain and rinse. To assemble, place half the noodles in an oiled 13x9-inch baking pan. Layer all squash mixture evenly over noodles. Top with all onions. Dab ricotta cheese over onions, then add mozzarella and 1 cup romano cheese. Layer last half noodles on top and sprinkle with final ¼ cup romano cheese. Cover and bake in a 400-degree oven for 40 minutes. Uncover and bake 10 to 15 minutes longer or until hot throughout.
3. For Red Pepper Sauce
Broil peppers on pan, turning often, until blistered and blackened on each side. Place in plastic bag and steam 10 minutes. Peel, seed and dice to get about 1 cup. Combine peppers with olive oil and garlic in electric blender and puree.