Heat small nonstick skillet on medium heat. Whisk first 3 ingredients until blended. Spray skillet with cooking spray. Add 1/3 cup eggs; tilt skillet to evenly cover bottom with eggs. Cover; cook 1 to 2 min. or until eggs are set. Slide omelette onto plate. Repeat with remaining eggs to make a total of 4 omelettes. Cover to keep warm until ready to use.