unsalted butter, room temperature • (1.75 oz, 5.5 Tbsp) powdered sugar • (1 oz, 2 Tbsp) egg, room temperature • cake flour or all-purpose flour • vanilla oil, optional • unsalted butter, room temperature • cinnamon sugar • (1.6 oz, 3 Tbsp) egg, room temperature • (1.75 oz, 8.5 Tbsp) ground almonds • cake flour or all-purpose flour • brandy • The cinnamon sugar can be replaced with 47g (1.6 oz) granulated sugar and 3g (1.5 tsp) cinnamon powder •