In the work bowl of a food processor, place flour, sugar, and salt; pulse until combined. Add cold butter, and pulse until mixture is crumbly. Add ice water, 1 tablespoon (15 grams) at a time, just until dough comes together.
Shape dough into a disk. Wrap tightly in plastic wrap, and refrigerate for at least 2 hours. Dough may be refrigerated for up to 3 days or frozen for up to 2 months.
Recipe by Bake from Scratch at https://staging.bakefromscratch.com/apple-pie-browned-butter-oat-streusel/