Place potatoes in colander and rinse. Dry on paper towels. In a large bowl, combine onion, flour and parsley. Stir in egg, egg white, salt and pepper. Add potatoes; mix well. Spray a large nonstick skillet with cooking spray. Heat skillet over medium high heat. Add 1 teaspoon of butter. Place about 3 Tablespoons of potato mixture in skillet; flatten into pancake with spatula. Make 3 more pancakes in skillet as directed. Cook until browned on the bottom, abut 7 minutes pressing with spatula. Turn carefully, cook until golden on other side, about 6 to 7 minutes. Place on a plate ad cover to keep warm. Repeat twice the remaining butter and potato mixture.
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