01 - Preheat oven to 350°F. Grease and line three 8-inch round cake pans with parchment paper.
02 - Whisk together flour, baking powder, and salt in a medium bowl.
03 - Beat butter and sugar in a large bowl until light and fluffy, approximately 3 minutes.
04 - Add eggs one at a time, beating well after each addition. Blend in melted white chocolate and vanilla.
05 - Add flour mixture in three parts, alternating with milk. Begin and end with flour, mixing until just combined.
06 - Divide batter evenly among prepared pans. Bake for 22-26 minutes until toothpick comes out clean. Cool in pans for 10 minutes, then release onto racks to cool completely.
07 - Combine sugar, evaporated milk, egg yolks, and butter in medium saucepan over medium heat. Cook stirring constantly until thickened and golden, about 10-12 minutes.
08 - Remove from heat. Stir in coconut, pecans, vanilla, and salt. Cool to room temperature.
09 - Place first cake layer on serving plate. Spread with one-third of filling. Repeat with remaining layers and filling. Garnish with white chocolate, coconut, or pecans if desired.
10 - Refrigerate assembled cake for 1 hour for cleaner slicing.