Preheat oven to 400°F. Place pie crust in a 9-inch pie pan.
1 premade refrigerated pie crust
In a large mixing bowl, whisk together the eggs and sugar until combined.
3 large eggs, 1½ cups granulated sugar
Next add in the butter, flour, buttermilk, lemon juice, vanilla, and salt.
½ cup unsalted butter, 3 tablespoons all-purpose flour, 1 cup buttermilk, 1 tablespoon lemon juice, 1 teaspoon pure vanilla extract, 1 teaspoon kosher salt
Whisk until everything is all combined and smooth.
Pour the batter into pie crust.
Place the pie in the oven and bake for 10 minutes.
After 10 minutes, reduce the heat to 350°F and bake about 40 minutes until golden and the middle is slightly jiggly.
Let cool on counter completely.
Refrigerate for at least 4 hours. Serve topped with whipped cream, if desired.
Whipped cream