
1 recipe Cookie-Coconut Crumb Crust or ⅓ recipe of Foolproof Piecrust
4 large eggs
1¼ cups granulated sugar, divided
¼ cup cornstarch
3 cups 2% reduced-fat milk
1 cup sweetened flaked coconut, plus toasted coconut chips for garnish
1 tablespoon salted butter
2½ teaspoons vanilla extract, divided
½ teaspoon cream of tartar