- Preheat oven to 350 degrees. In a small saucepan over medium heat, bring milk to a simmer. Meanwhile, in a large bowl, combine sugar, yolks, and cornstarch. Slowly pour milk into yolk mixture, stirring constantly.
- Melt butter, then stir in brown sugar, vanilla, coconut, and walnuts. Add to milk mixture and stir to combine. Evenly distribute filling between pie crusts.
- Bake until filling is set and a skewer inserted into center of pies comes out clean, 30 to 45 minutes. Chill overnight before serving. Serve with blueberries and lightly sweetened whipped cream.