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WRAP handle of 10-inch nonstick skillet with foil. Heat oil in skillet on medium heat. Add chopped vegetables and hash browns; cook 5 min., stirring occasionally.
WHISK eggs, water and mustard until blended; pour over vegetable mixture. Cook 10 min. or until center is almost set; top with cheese.
HEAT broiler. Broil frittata, 6 inches from heat, 5 min. or until cheese is melted.