In a large bowl, mix together the gluten-free flour, salt, and sugar. Stir until combined.
Add the cold vegan stick butter and vanilla extract. Use a pastry dough blender to combine until the crust is crumbly and the butter is mostly blended. Next, add the non-dairy milk 1 tbsp at a time and mix with your hands.
Press the dough into a parchment-lined 8 x 8-inch baking dish. Poke several holes in the dough with a fork.
Bake at 400 degrees Fahrenheit for 15-20 minutes or until the edges turn golden brown. When finished, remove the crust from the oven and set aside. Lower the oven to 350 degrees Fahrenheit.
Making the Pecan Pie Filling
While the crust is baking, mix all ingredients for the pecan pie topping together in a cold sauté pan. Once the cornstarch is fully dissolved in the filling mixture, heat the mixture over medium heat for 5-10 minutes or until the mixture just begins to thicken.
Remove the pan from heat and pour the mixture over the pre-baked shortbread crust. Return the baking dish to the oven and bake at 350 degrees Fahrenheit for an additional 20-30 minutes or until the pecan mixture is bubbling.
Remove the baking dish from the oven and let the pie cool completely to room temperature then refrigerate covered with plastic wrap for at least 2 hours to fully set.
Once set, sprinkle the top of the pie filling with flaky sea salt if desired. Cut to your preferred size, serve, and enjoy!
Notes
*A note about granulated sugar: Not all granulated sugar is vegan, make sure to choose a USDA Organic variety to ensure it is not processed with bone char, an animal ingredient.**Please note: The nutritional information provided for each recipe is an estimate and may vary depending on the specific brands of ingredients used, portion sizes, and preparation methods. For accurate nutritional details, consider consulting a registered dietitian or using a trusted nutritional calculator.
Not Vegan? Use regular butter for the shortbread crust and/or pie filling. Use dairy milk instead of plant milk.
Not Gluten-Free? Use any store-bought pie crust or puff pastry you prefer.
Want to mix it up? Add chopped cashews, pumpkin seeds, or chocolate chips for a twist on this classic dessert.