Preheat oven to 375 degrees F. Coat a 3-quart casserole dish with nonstick 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. Stir in ground beef mixture and the remaining ingredients, except the paprika and mix well. Place into the prepared casserole dish and sprinkle with paprika.
Cover and bake 25 to 30 minutes, or until heated through.