In a bowl, add the almond flour, gluten free all purpose flour, salt and sugar (omit for savory pies). Stir to combine.
To that same bowl with the combined dry ingredients, add the flax egg mixture and a few tablespoons of water. Stir well until the dough starts to get more compact.
Transfer the ball of dough to a piece of parchment paper. Flatten the dough and use a rolling pin to roll it into an even circle about 10 inches in diameter.
Flip the parchment paper with the dough on it into a pie plate. Press the dough into the corners of the pie plate. Remove the excess dough from the edges. Fix any cracks or empty spots with the excess dough from the edges. Flute the edges if you wish.