• 1 tablespoon butter
• 1 large or 2 small apples, peeled and thinly sliced (about 1 1/2 cups)
• 1 tablespoon packed brown sugar
• 1 1/2 teaspoons ground cinnamon, divided
• 2 eggs
• 2 egg whites
• 1 tablespoon granulated sugar
• 1 teaspoon vanilla
• 1/4 teaspoon salt
• 1/2 cup all-purpose flour
• 1/2 cup milk
• sugar-free maple syrup (optional)

Preheat oven to 425 degrees.

Melt butter in medium cast iron or ovenproof skillet over medium heat.  Add apples, brown sugar and 1/2 teaspoon cinnamon; cook and stir five minutes or until apples just begin to soften.  Remove from heat.  Arrange apples slices in single layer in skillet.

Whisk eggs, egg whites, granulated sugar, remaining 1 teaspoon cinnamon, vanilla and salt in medium bowl until well blended.  Stir in flour and milk until smooth and well blended.  Pour evenly over apples.

Bake 20 to 25 minutes or until puffed and golden brown.  Serve with maple syrup, if desired.