Preheat oven to 350 degrees.
Start by melting your butter and allowing it to cool.
1/2 cup butter
To a large bowl, add room temp eggs and beat well.
3 large eggs
Add remaining ingredients to the same bowl and mix to combine, stirring as you add them. Pour mixture into unbaked pie crust.
1 1/2 cups sugar, 1/2 cup butter, 2 heaping tbls all purpose flour, 1/2 cup buttermilk, 1 tsp vanilla extract
Bake in 350-degree oven for 60 minutes, or until the center is set. The middle may still jiggle some but should not be liquid. Once the pie cools, the center should set fully.