Buttermilk Pie – a Southern Classic

INGREDIENTS

9-inch frozen pie crust in foil tin, thawed but still cool

1/2 cup

unsalted butter, softened

1 cup

+ 1 Tablespoon granulated sugar, divided

3 tbsp

all-purpose flour

1/2 tsp

salt

large eggs + 2 egg yolks

1 cup

buttermilk (anything but nonfat)

2 tsp

distilled white vinegar

1 1/2 tsp

vanilla

freshly whipped cream, for serving (optional)