Wake Up Casserole

Directions

1. Preheat oven to 325 degrees F. Spray a 9 by 13 inch nonstick baking pan with cooking spray.
2. Arrange one third of the sliced potatoes over bottom of pan. Layer 1/2 cup ham over potatoes and sprinkle 1/2 cup cheese over ham. Repeat layers twice.
3. Whisk egg and egg whites in a medium bowl until well blended. Stir in milk, thyme, green onions, salt, pepper and mustard; mix well. Pour evenly over ham and cheese.
4. Cover with foil and bake 1 hour and 40 minutes. Remove foil; sprinkle with remaining 1/2 cup cheese. Bake 5 minutes longer, or until edges are golden and a knife inserted near the center comes out clean.