This dish has been a longtime family favorite for Christmas morning. It is light, airy, and filled with eggs and juicy apple. I like to serve it alongside bacon or sausage. —Teeny McCloy, Red Deer, Alberta
Preheat oven to 400°. Place butter in a 13x9-in. baking dish. Heat until melted, 5-8 minutes. Stir in apples, brown sugar and cinnamon. Bake until apples are tender, 15-18 minutes.
Meanwhile, in a small bowl, whisk egg yolks, flour, milk, baking powder and salt until smooth. In a large bowl, beat egg whites on medium speed until soft peaks form. Gradually add sugar, 1 tablespoon at a time, beating on high until stiff peaks form.
Fold egg whites into egg yolk mixture. Spread over apples. Bake until set and golden, 12-15 minutes. If desired, sprinkle with confectioners' sugar.