1. Preheat the oven to 180°C (350°F). Lightly grease a 22 cm (9-inch) pie dish.
2. In a bowl, mix the pecan pulp, oat flour, melted coconut oil, maple syrup, cinnamon, and salt until a soft dough forms.
3. Press the dough evenly into the base and sides of the pie dish. Prick the bottom with a fork.
4. Pre-bake the crust for 10 minutes to set it slightly.
5. In a mixing bowl, whisk together the pumpkin purée, pecan milk, maple syrup, cornstarch, vanilla extract, and spices until smooth.
6. Pour the filling over the pre-baked crust and smooth the surface.
7. Bake for 35–40 minutes, until the edges are slightly firm and the center is just set (it will continue to firm up as it cools).
8. Cool completely, then refrigerate for at least 3 hours before slicing.