Prepare the Flax Egg: Combine 1 tablespoon ground flaxseed with 3 tablespoons water and let it sit for 5-10 minutes until it thickens.
Preheat Oven: Heat your oven to 375°F (190°C).
Mix Dry Ingredients: In a large mixing bowl, whisk together the oat flour, tapioca flour, salt, and baking powder.
Combine Wet Ingredients: In a separate bowl, mix the tahini, applesauce, and flax egg until well combined.
Combine Wet and Dry Mixtures: Add the wet mixture to the dry ingredients and stir until combined. Depending on the moisture level of your mixture, start by adding a small amount of warm water (one tablespoon at a time) to achieve a dough consistency. The dough should be firm and pliable but not too sticky or wet. You may not need to use all the water, or you might not need it at all, or you will need more depending on climate, temperature, and consistency of ingredients.
Form the Dough: Knead the dough gently on a surface dusted with oat flour. If it feels too sticky, add more oat or tapioca flour until it's manageable.
Roll Out the Dough: Place the dough between two pieces of parchment paper* to prevent sticking. Roll it out to the desired thickness and size to fit your pie dish.
Transfer to Pie Dish: Carefully peel off the top layer of parchment paper and invert the dough into your pie dish. Press it firmly but gently into the dish, shaping the edges as desired, and working with your fingers until you cover all the dish/pan**. Trim any excess dough.
Dock the Crust: Use a fork to prick the bottom and the sides of the crust several times. This helps to release steam and prevents the crust from puffing up during baking. If you use this crust for pies that cook up to 45 minutes or more, you don't need to pre-bake it.
Pre-Bake (Optional, fillings that require baking): For a pre-baked crust, bake in the oven for 15 minutes or until it turns golden around the edges. Add the filling, and continue baking *** following your recipe, keeping an eye on the crust to prevent over-browning.
For no-bake pies (or cold fillings): Bake the pie crust for 20-25 minutes (in the center rack); Let it cool for 20 minutes before filling.
Enjoy your delicious vegan, gluten-free, nut-free, and oil-free pie crust!