Spaghetti Pizza

1 (7 oz.) package spaghetti, uncooked
1/2 cup skim milk
1 egg, beaten
Vegetable cooking spray
1/2 pound lean ground beef
1 medium onion, chopped
1 medium green pepper, chopped
2 cloves garlic, minced
1 (15 oz.) can tomato sauce
1 teaspoon Italian seasoning
1 teaspoon any salt-free herb seasoning
1/4 teaspoon pepper
2 cups sliced fresh mushrooms
2 cups shredded part-skim 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. In large skillet, cook beef, onion, green pepper and garlic until beef is no longer pink; drain. Add tomato sauce and seasonings; simmer 5 minutes. Top with mushrooms and cheese. Bake in 350 degrees F. oven for 20 minutes. Let stand 5 minutes before cutting. Refrigerate leftovers.