Butterscotch Cinnamon Pie - Pizzazzerie

Ingredients

• 1 pie crust
• 1 1/4 cups dark brown sugar
• 2 tablespoons all-purpose flour
• 2 tablespoons cornstarch
• 1/2 teaspoon salt
• 2 teaspoons cinnamon ((ground))
• 2 cups whole milk
• 3 large egg yolks ((room temperature))
• 1/4 cup unsalted butter ((4 tablespoons))
• 2 teaspoons vanilla extract