Coconut Cake

Name: Coconut Cake
Ingredients: 3 cups (361g) King Arthur Unbleached Cake Flour or; 2/3 cup (71g) coconut milk powder*; 1/2 teaspoon salt; 4 teaspoons (14g) baking powder; 10 tablespoons (142g) unsalted butter room temperature; 1 1/2 cups (298g) sugar; 6 large (210g) egg whites; 1 1/2 cups (340g) whole milk at room temperature; 1 1/2 teaspoons vanilla extract; 4 drops coconut flavor optional; 15 tablespoons (213g) unsalted butter at room temperature; 10 ounces (283g) cream cheese at room temperature; 3/4 teaspoon vanilla extract; 3/8 teaspoon salt; 1/4 teaspoon coconut flavor optional for enhanced flavor; 1/4 cup + 1 tablespoon (35g) coconut milk powder*; 4 1/4 to 4 1/2 cups (482g to 510g) confectioners' sugar; 1 1/2 cups (128g) shredded coconut sweetened