Preheat oven to 375 degrees F. Coat a 3-quart casserole dish with cooking spray.
In a large skillet, heat oil over medium heat and saute onion 2 to 3 minutes. Add ground beef and cook 4 to 6 minutes, or until browned.
In a large soup pot, cook noodles according to package directions; drain well and return noodles to pot. Add ground beef mixture and remaining ingredients, except paprika; mix well. Place in prepared casserole dish and sprinkle with paprika.
Cover and bake 25 to 30 minutes, or until heated through.