How to Make It
Place the oats in the bowl of a food processor and process until it very finely ground, about 1 minute. Add the almond meal, butter, sugar, and salt and process until dough is crumbly but holds together when squeezed in the palm of your hand.
Preheat the oven to 350°F. Transfer the dough to a 9-inch pie plate. Using a flat-bottomed measuring cup or glass, press the dough evenly into the bottom and up the sides of the plate, being sure to press evenly into the corners. Freeze until firm, 10-15 minutes.
Place pie plate on a rimmed baking sheet and bake until golden and dry to the touch, 27–32 minutes. Let cool completely before filling.