1. Preheat oven to 350'.
2. Combine oats, flour, brown sugar, & walnuts.
3. Cut butter into small pieces & combine with dry ingredients.
4. Pour half of the mixture into a buttered 8 by 8 baking pan, then spread cranberry sauce over it.
5. Top cranberry sauce with the rest of the flour mixture.
6. Bake 45 minutes & serve warm with whipped cream or vanilla ice cream.