Preheat the Ninja Foodi on Air Crisp at 375°F/190°C while you make the crumb topping and assemble the pie.
Combine the oatmeal, brown sugar, flour, and salt in a medium size bowl. Mix to combine.
Slice the very cold butter into tsp size slices and add to the dry mixture. Cut the butter into the dry mixture using a fork or a pastry blender. You can also use a stand mixer if prefered.
The butter will combine with the dry ingredients and form small pebbles. If you have loose flour after cutting in all the butter, you can add more cold butter. I have not had to do that though.
Nutritional Values are based on using homemade pie crust and filling and will vary based on what you use as the base of your apple pie. Nutritional values are provided as a courtesy and thesaltedpepper.com makes no guarantees of accuracy. We do our best to ensure they are accurate, but many factors influence nutritional values that are beyond our control. Different brands of items have different nutritional values, so it is always best to do your own independent nutritional analysis based on the items you are using in a recipe if you require a high level of accuracy. Thesaltedpepper.com will not be held accountable for any errors in the displayed nutritional information.