In a large nonstick skillet coated with cooking spray, brown roast on all sides. Transfer to a 5-qt. slow cooker. Add water to the skillet, stirring to loosen any browned bits; pour over roast. Sprinkle with seasoned salt, soy sauce, Worcestershire sauce and garlic powder. Top with apple and onion. , Cover and cook on low for 5-6 hours or until the meat is tender., Remove roast and onion; let stand for 15 minutes before slicing. Strain cooking liquid into a saucepan, discarding apple. Bring liquid to a boil; cook until reduced to 2 cups, about 15 minutes. Combine cornstarch and cold water until smooth; stir in browning sauce. Stir into cooking liquid. Bring to a boil; cook and stir for 2 minutes or until thickened. Serve with beef and onion.