
Preheat oven to 350°F. Grease a square oven-to-table dish or 9”x 9” pan.
Cut the apples in half and remove the cores. Use a hasselback cutter or sharp knife to slice the apples thinly into without cutting all the way through to the bottom. Remove the 2 or 3 smallest pieces at the ends and reserve for another use. Set aside.
Beat the egg whites until soft peaks form. Add the sugar and continue beating until stiff. Add the egg yolks on at a time. Add remaining ingredients.
Pour batter into prepared pan. Place the sliced apple halves, round-side up, in the batter close to each other. Alternate placing them across and down, until the whole pan is filled.
Bake 35 to 40 Minutes, until the batter is puffed and golden.
