HEAT oil in large nonstick skillet on medium-high heat. Add broccoli and onion; cook and stir 4 minutes or until tender-crisp. Add beef; cook and stir 6 minutes or until desired doneness.
MIX water, soy sauce and Seasoning Mix in small bowl. Add to skillet; stirring constantly, bring to boil on medium heat and boil 1 minute or until sauce has thickened.