Hokkaido Rum and Raisin Buttercream Sandwich Cookie

Name: Hokkaido Rum and Raisin Buttercream Sandwich Cookie
Ingredients: 130 gram Unsalted butter; 250 gram Cake flour; 60 gram Almond flour; 60 gram Granulated sugar; 2 Egg yolks; 3 gram Salt; 4 gram Baking powder; 90 gram Rum aged raisin; 15 gram Spiced rum; 45 gram Granulated sugar; 15 gram Dry milk powder; 1/2 teaspoon Vanilla bean paste; 100 gram Unsalted butter; 50 gram White chocolate