Preheat the oven to 350℉. Spray a 9-inch pie plate with cooking spray.
Make the crust. In a large mixing bowl, combine the oat flour and sugar and stir. In a separate small bowl, whisk together the egg and avocado oil until creamy.
Pour the egg mixture into the bowl with the flour mixture and stir until combined and a dough is formed.
Use your hands to gather the dough into a ball. Place the ball of dough between two sheets of parchment paper. Using a rolling pin, roll it out to ⅛- to ¼-inch thick. Flip the flattened dough across the pie plate, using your fingers to press onto the bottom, fix any cracks and seal around the edges. Set aside until ready to use.
Make the pie filling. Combine the chocolate chips and butter in a large microwavable-safe bowl. Heat for one-minute and stir until melted. If needed to further melt, continue to heat in 20 second intervals, stirring between each until creamy.
Whisk the sugar into the melted chocolate mixture. Add in the eggs, maple syrup, vanilla extract, cinnamon, and sea salt. Whisk until creamy and fully combined. Fold in the chopped pecans and stir until incorporated.
Transfer the pie filling to the pie plate with the crust. Bake for 45 to 50 minutes until the edges are slightly firm to the touch and slightly cracked. The center may look darker in color and still “jiggle,” but the pie will firm as it cools.
Allow the pie to cool completely at room temperature (at least 1-2 hours) before transferring to the refrigerator to further set (at least 2 to 4 hours).