Get out a 9” (23cm) pie plate that’s oven-safe and suitable for transitioning from the fridge or freezer to a hot oven (refer to the post for additional information - I use this one). Do not grease.
In the bowl of a food processor equipped with an S-blade, combine the flour, granulated sugar, and salt. Pulse a few times.
1 1/4 cups (173 grams) Bob's Red Mill 1-to-1 Gluten-free Baking Flour, 1 tablespoon granulated sugar, 1/2 teaspoon fine sea salt
Switch the processor to the lowest speed and add the butter. Process until you have pea-sized bits of butter; avoid overprocessing.
1/2 cup (113 grams) unsalted butter
Evenly drizzle vanilla extract and apple cider vinegar over the mixture.
1 teaspoon vanilla extract, 1/2 teaspoon apple cider vinegar
At the lowest speed, pour in 2.5 tablespoons of water. The required water quantity depends on factors like the temperature of your ingredients and kitchen. Through multiple trials with the same brand of ingredients, I've found a range between 2.5 and 5.5 tablespoons.
2.5 to 5.5 tablespoons (37 to 81 grams) cold water
Process briefly until the dough starts coming together; it should have a shaggy appearance rather than forming a uniform ball. Pinch some together, and if it holds without being excessively crumbly, it's ready. Be cautious not to add too much water, as an excess leads to a non-flaky pie crust. If needed, add more water, 1 teaspoon at a time. If you can form a disc without it crumbling apart, it's another indication that it's ready.
Place the dough in the center of a large piece of plastic wrap and shape it into a flat disc, approximately 1” (2.5cm) or slightly less. If it remains crumbly and doesn't form a disc, it requires a touch more water.
Chill the dough for a minimum of 45 minutes and up to 2 days.