Heat oil in Dutch oven over med. heat. Add onion, garlic; saute 3 min. Add kale and spinach, stirring well. Reduce heat to med-low; cover and cook 20 min or until greens are wilted, stirring occasionally. Remove from heat and spoon into a 2-qut baking dish coated with cooking spray.
Heat olive oil in Dutch oven and partially cook potatoes.
Preheat oven to 350deg F.
Place yogurt through egg white in food processor; process until smooth. Add potatoes to mixture and pour over greens in baking dish, stirring gently. Sprinkle with Parmesan cheese and sunflower seeds.