Combine broccoli, carrot, if desired, and water in 10-inch nonstick skillet. COOK over medium heat until tender, stirring occasionally to break up broccoli, about 10 minutes; drain well.
Beat eggs, milk, mustard, salt and pepper in large bowl until blended. ADD broccoli mixture, cheese and green onion; mix well.
Coat same skillet with cooking spray; heat over medium heat until hot. POUR IN egg mixture; cook over low to medium heat until eggs are almost set, 8 to 10 minutes.
Remove from heat. COVER and LET STAND until eggs are completely set and no visible liquid egg remains, 8 to 10 minutes. CUT into wedges.