Cut, peel, and slice enough apples to cover the bottom of 9 x 9 inch pan. Sprinkle the apples with cinnamon.
Mix butter, oatmeal, and birch sugar (or another sugar substitute) in a separate bowl. The mixture should be on the dry side. Add more oatmeal if needed.
Approximately 6 big apples
1 cup Sugar (Birch sugar or other sugar substitute is ok)
2 cups oatmeal
1 cup melted butter