Beat the egg whites until they form soft peaks and set aside in a bowl.

Cream the butter in the same mixing bowl until it is fluffy.

Beat the egg yolks into the butter, one at a time.

Mix in the sour cream and the flour alternately, making sure to beat well with each addition of cream or flour.

Stir in the cinnamon, if you are using cinnamon.

Fold in the egg whites.

Add the sliced apples and gently stir into the mixture.

Bake in your preheated Belgian waffle iron according to the manufacturer's instructions or until crisp and brown.

Enjoy your wonderful low carb variation of the classic Belgian waffle!