Kue Gula Lembut

Bahan-bahan (24 porsi)

• 1 cup unsalted butter, (room temperature)
• 1 ⅓ cup granulated sugar, (plus ¼ cup for rolling)
• 1 large egg, (plus 1 egg yolk at room temperature)
• 1 teaspoon vanilla extract
• 2 ⅓ cup all-purpose flour
• 1 teaspoon baking powder
• ½ teaspoon salt