Christmas Sugar Cookies

Bahan-bahan (24 porsi)

• 1 cup unsalted butter
• 1 cup granulated white sugar
• 2 teaspoons pure vanilla extract
• 1 egg
• 3 cups all purpose flour (or plain flour)
• 3/4 teaspoon salt
• 1/2 teaspoon baking powder
• 1/4 cup water
• 1 tablespoon royal icing mix (or more, the consistency should be thick and creamy)