HEAT oven to 350°F.
COOK spaghetti in large saucepan as directed on package. Meanwhile, brown meat in skillet.
DRAIN spaghetti; return to pan. Add egg and milk; toss to coat. Spread onto bottom of 12-inch pizza pan sprayed with cooking spray. Stir tomato sauce and dressing mix into meat; spread over spaghetti. Top with cheese.
BAKE 20 to 25 min. or until crust is set and cheese is melted.
