Heat 375. Spray a 2-quart casserole dish w/ cooking spray. Cook pasta as directed, adding veggies the last 5 mins. Drain and return to pot.
In lg saucepan, whisk together milk and flour until smooth. Whisk in salt and pepper. Bring to a boil, stirring constantly. Remove pan from heat.
Stir in cheese until melted. Stir in pasta and veggies. Spoon into casserole dish Sprinkle w/ bread crumbs. Lightly spray top of casserole w/ olive oil or butter cooking spray. Bake 20 mins,or until bubbly.