HEAT oil in large nonstick skillet on medium-high heat. Add potatoes and chopped vegetables; cook 5 minutes or until potatoes are browned, stirring occasionally.
BEAT eggs, milk and salt with wire whisk until well blended. Pour evenly over potato mixture; cover. Reduce heat to medium-low.
COOK 10 to 12 minutes or until center is set. Sprinkle with cheese; cover. Let stand 5 minutes. Cut into 6 wedges to serve.