In 10-inch ovenproof skillet, over medium-high heat, cook broccoli, mushrooms, red pepper and onions in spread until tender-crisp, about 5 minutes.
Remove from heat.
In small bowl, with electric mixer at medium speed, beat eggs, mustard, water and Italian seasoning until foamy; stir in cheese.
Pour mixture into skillet over vegetables.
Bake at 375°F for 20 to 25 minutes or until set.