Preheat the oven to 375ºF. Spray a 9" pie plate with non-stick cooking spray.
In a mixing bowl, whisk together the eggs, pumpkin, sugar, salt, and spices until smooth. Pour into the prepared pan.
In a medium bowl, use a pastry cutter to cut together the oats, sugar, flour, baking soda, baking powder and butter until you get coarse crumbs.
Sprinkle the oat crumbs over the top of the pumpkin filling.
Bake for about 40 minutes, until the pie is mostly set (the center may still be slightly jiggly). Internal temperature of the pie should be about 175ºF.
Allow the pie to cool to room temperature on a wire rack. Then cover and refrigerate until serving.
