Preheat the oven to 350 degrees.

Grease an eight- or nine-inch round baking pan with butter.

Cut up apples into small cubes, and layer the pan with the apples so they cover the bottom.

Dust the apples with cinnamon, to taste.

Separate the egg whites and yolks into two mixing bowls.

Beat the eggs (preferably with an electric mixer) thoroughly.

Add about half of the cup of sugar to each bowl (doesn’t need to be exact). Beat again until the whites are foamy and each is thoroughly mixed.

Combine the egg mixtures into one bowl, add the flour and fold together until everything is just combined.

Pour the mixture over the apples.

Bake for about 30 minutes or until a toothpick inserted in the center comes out clean.