Snickerdoodle Pie recipe - from the Carol's Family Cookbook Family Cookbook

Ingredients

• 1 9 in. pie shell
• 1/4 tsp cinnamon
• 1 cup Plus 1 tbsp sugar
• 4 tbsp unsalted butter, melted and cooled
• 1 1/2 cup buttermilk
• 4 large egg yolks
• 1/4 cup all- purpose flour
• 1 tsp vanilla extract
• 1/4 tsp salt