Directions

1. Cook pasta al dente according to package directions. Drain; set aside.
2. Meanwhile, melt butter in a large skillet over medium-high heat. Add onion and mushrooms; sauté 6 minutes or until onion is tender and liquid evaporates. Add prosciutto; sauté 2 minutes. Remove skillet from heat.
3. Preheat oven to 350°F. Lightly coat an 11x7-inch baking dish with nonstick cooking spray. Whisk together milk, eggs, salt and pepper; set aside. Place pasta in baking dish. Top with reserved onion mixture, bell peppers, and cheese. Drizzle reserved milk mixture over cheese.
4. Place dish in oven. Bake 30 minutes or until golden and edges are bubbly. Serve hot.