Preheat oven to 375 F. Lightly oil a 9-inch pie pan.
Put the oats into a food processor or blender and process until finely ground. Add the remaining dry ingredients and blend well. Transfer to a bowl and add the apple sauce. Stir well until completely combined.
Put the mixture into the pie pan, and starting at the center, flatten and press it with moistened fingers until it evenly covers the bottom and extends up the sides of the pan as far as possible.
Put it in the oven and cook for 8-10 minutes, until it it is crisp but not overdone. Set aside to cool before filling.