Instructions

• Preheat the oven to 350°F (175°C).
• Fit the one 9-inch unbaked pie crust into a 9-inch pie plate and crimp the edges.
• In a large bowl, stir together 1¼ cups granulated white sugar and 1/4 cup all-purpose flour until evenly combined.
• Add 2 cups buttermilk, 3 large beaten eggs, 1 teaspoon vanilla extract, and 1/4 cup (1/2 stick) salted butter, melted to the sugar–flour mixture. Whisk until the filling is smooth and homogenous.
• Pour the filling into the prepared unbaked pie crust, smoothing the top gently.
• Bake on the middle oven rack for 35 to 40 minutes, or until the custard is set (the center should be mostly firm with only a slight jiggle).
• Remove the pie from the oven and let it cool to room temperature before slicing and serving.