Grandma's Sweet Blueberry Buttermilk Pie Recipe - Beard and Bonnet

Ingredients

• 1 pie dough, 13-inch
• 1 pint blueberries (fresh or frozen)
• 3 large eggs
• 1 cup buttermilk (240 ml)
• 1 ½ cups (300 g) granulated sugar
• 8 tbsps unsalted butter, melted
• ¼ cup (30 g) all-purpose flour
• ½ tsp vanilla extract
• Confectioners sugar (for dusting)