- Preheat the oven to 375°F . Lightly spray a 9-inch pie pan with cooking spray.
- To make the crust : In a large bowl, whisk together the oat flour, almond flour, sugar, arrowroot, cinnamon, vanilla powder (if using), baking soda, and salt.
- Cut in the butter and vinegar until it has the texture of wet sand and no pieces are larger than your pinkie fingernail.
- Pour the mixture into the pie pan and use your hands to evenly distribute and spread the crust along the bottom and up the sides. Bake for 10 minutes. Remove from the oven and let cool completely before adding the filling.
- To make the filling : In a food processor, combine the peanut butter, tofu, coconut cream, sugar, tapioca powder, vanilla, and salt. Process until smooth. Pour into the prepared crust. Refrigerate until ready to use.
- To make the crumble : In a small bowl, combine the ingredients and stir with a fork until crumbly. Sprinkle the crumbles over the top of the pie. Chill for at least 2 hours, or until ready to serve.
- Leftovers will keep in an airtight container in the fridge for 1 to 2 days.