Potato-Onion Frittata

Ingredients

 * 6 cooked small new potatoes, peeled and sliced (about ¾ lb.)
 * 3 large eggs
 * 2 large egg whites
 * 2 tbs. low-fat milk
 * salt and freshly ground pepper to taste
 * 3 tbs. shredded cheddar cheese
 * 2 green onions (white and pale green parts), sliced diagonally
 * 2 tsp. olive oil
 * 1 small onion, chopped

Directions

 * 1) In 8 or 9-inch nonstick ovenproof skillet, heat oil over medium heat.
 * 2) Add all onions and cook, stirring occasionally, until softened, 5 minutes.
 * 3) Add potatoes to skillet, spreading to cover bottom of pan.
 * 4) In medium bowl, whisk together eggs, egg whites, milk, salt and pepper.
 * 5) Reduce heat to low and pour egg mixture over vegetables, covering evenly.
 * 6) Cover and cook until egg mixture has set around edges but center is still liquid, 6 to 8 minutes.
 * 7) Preheat broiler.
 * 8) Scatter cheese over surface.
 * 9) Place skillet under broiler and cook until lightly golden, about 1 minute.
 * 10) Cut the frittata into 4 wedges and serve warm.