01 -
Set the oven temperature to 350°F (177°C) to prepare for baking.
02 -
In a large mixing bowl, blend together granulated sugar and all-purpose flour until evenly combined.
03 -
Add buttermilk, melted salted butter, eggs, fresh lemon juice, and vanilla extract into the sugar and flour mixture. Whisk thoroughly until smooth and homogeneous.
04 -
Pour the filling mixture into the 9-inch deep dish pie crust set on a sheet tray to catch any overflow during baking.
05 -
Bake in preheated oven for 55 to 70 minutes until the top is golden brown and the filling is set but slightly jiggly in the center. If browning too quickly, cover loosely with foil.
06 -
Allow to cool at room temperature for at least 3 hours before serving. Optional to chill in the refrigerator and garnish with powdered sugar or whipped cream.