In a large bowl, whisk together the oat flour, sugar, and salt.
In a medium-size bowl, whisk together the egg and olive oil.
Pour the wet mixture into the dry mixture and stir it together using a fork until the mixture comes together. It may take a minute or two, and be sure to scrape the bottom of the bowl. It should look like clumps of wet sand.
Using your hands, form a ball with the dough and flatten it slightly so it's shaped like a disk. If you find your dough is too dry to form a ball, add a little more olive oil, one teaspoon at a time. If your dough is too wet, sprinkle a little more oat flour.
Transfer the dough to a piece of wax or parchment paper. Using a rolling pin, roll the dough out into an even circle. Start in the center and work your way out, turning the wax paper. It doesn't have to be a perfect circle; just be sure you have a ½-1 inch overhang from your pie plate. Place your pie plate on top for reference. If your dough sticks to your rolling pin, spray it with non-stick spray.
Once it's the correct diameter, invert your pie plate on top of the dough and gently slide one hand underneath the wax paper. Use the other hand to hold the pie plate and flip the plate so that the wax paper is on top. Remove the wax paper, and now the dough should be inside your pie plate.
Press the dough into the pie plate and around the sides. The dough is easy to work with. If a piece falls off, simply patch it back, and you may need to even out the sides by transferring the dough to where it's needed.
Flute the edge if desired or you can do a simple fork edging. Here is a great tutorial on ways to decorate pie crust edges. Proceed with your pie according to the directions. For no-bake pies: Poke the bottom of the crust with a fork a few times, and bake it at 400°F for 10 minutes. Enjoy!