Blend tomatoes, water, half the onions, chiles and 1 cup cilantro in blender until smooth. Chop remaining cilantro; set aside. Place chips in large skillet; top with tomato mixture. Bring to boil.
Break eggs, 1 at a time, into small bowl; slip egg into skillet, leaving space between eggs. Cover; cook on medium-low heat 12 min. or until whites are completely set and yolks begin to thicken but do not become firm.
Top each egg with 1 Singles; cook, covered 3 min. or until melted. Serve with sour cream, remaining onions and reserved chopped cilantro.