01 - Whisk together flour, salt, and black pepper in a large bowl.
02 - Add cold butter cubes and cut into the flour using a pastry cutter or fingertips until the mixture resembles coarse crumbs with some pea-sized pieces.
03 - Stir in the Greek yogurt or sour cream, if using.
04 - Gradually drizzle ice-cold water while mixing with a fork until the dough just begins to come together; add more water by teaspoon increments as needed without overworking.
05 - Shape the dough into a ball, flatten into a disk, wrap tightly in plastic wrap, and refrigerate for at least 30 minutes before use.
06 - Roll out the dough and fill with desired savory ingredients according to your preferred method.