1/2 (15-ounce) package refrigerated pie dough (such as Pillsbury)
Cooking spray
2 cups 1% low-fat milk
1 cup half-and-half
1 1/2 cups flaked sweetened coconut
1 vanilla bean, split lengthwise
2/3 cup sugar
1/3 cup cornstarch
1/4 teaspoon salt
4 large egg yolks
2 tablespoons butter
3 large egg whites, at room temperature
1/2 teaspoon cream of tartar
1/2 cup sugar
1/4 cup water
1/4 cup flaked sweetened coconut, toasted