Chicken Alfredo Spaghetti Pizza

1 (7 oz.) package spaghetti, uncooked
1/2 cup milk
1 egg, beaten
Vegetable cooking spray
1 cup cooked chicken chunks
1 medium onion, chopped
1 medium green pepper, chopped
1 medium tomato, chopped
1 (1.25 oz.) package Alfredo sauce mix
2 tablespoons butter or margarine
3/4 cup milk
1/4 cup Parmesan cheese
2 cups sliced fresh mushrooms
2 cups shredded mozzarella cheese

Prepare spaghetti as package directs. In medium bowl, blend milk and egg; add spaghetti and toss to coat. Spray 15x10-inch jellyroll pan with vegetable cooking spray. Spread spaghetti mixture evenly in prepared pan.

Make Alfredo sauce according to package directions. Spread over spaghetti mixture. Top with cooked chicken chunks, onion, green peppers, tomatoes, Parmesan cheese, mushrooms and cheese.

Bake in 350 degrees F. oven for 20 minutes. Let stand 5 minutes before cutting. Refrigerate leftovers.