Spray 12-inch nonstick skillet with cooking spray; heat over medium-high heat. Add undrained tomatoes and potatoes. Cook 6 to 8 minutes or until potatoes are tender and liquid has evaporated, stirring occasionally. Remove from skillet.
Add oil to skillet; reduce heat to medium-low. Pour Egg Beaters into skillet; cook 30 seconds. Spoon potato mixture evenly over Egg Beaters. Cook 7 minutes or until set, running flexible spatula around edge of skillet to keep frittata loosened.
Sprinkle with cheese. Cut into 4 wedges to serve.
COOK'S TIPS: Use Ro*Tel® Mild Diced Tomatoes & Green Chilies for a milder flavor, if desired.