Preparation time: 20 minute; Cooking time: 1 hour 30 minute

• 4 medium sized potatoes, sliced about 1/4" thick
• 1 small onion, sliced into rings
• 1/2 cup cheddar cheese, shredded
• 1/2 cup plain, non-fat Greek yogurt
• 4 oz reduced fat cream cheese
• 2 cups milk, fat-free
• 1 Tablespoon butter
• 1 teaspoon salt
• 1 Tablespoon flour, whole wheat
• Additional salt and pepper to taste

1. Preheat oven to 400°. Spray a 1 quart casserole dish with non-fat cooking spray.
2. Layer 1/2 of the potatoes into bottom of the prepared casserole dish. Top with the onion slices, and add the remaining potatoes. Season with salt and pepper to taste.
3. In a medium-size saucepan, melt butter over medium heat. Mix in the flour and salt, and stir constantly with a whisk for one minute. Stir in milk. Cook until mixture has thickened. Stir in cream cheese, shredded cheese, and yogurt all at once, and continue stirring until melted, about a minute or so.
4. Pour cheese over the potatoes, and cover the dish with aluminum foil.
5. Bake for about 1-1 ½ hours, or until potatoes are cooked through, and top of potatoes has begun to brown and crisp.

http://www.laaloosh.com/2012/11/07/cheesy-au-gratin-potatoes-recipe/#ixzz2NMvgMTg1