• Melt the butter at a very low temperature and let it cool for a while.
• In the mixer bowl, combine all the dough ingredients along with the butter and beat with the hook until a dough ball forms around it.
• Alternatively, knead all the ingredients by hand until fully incorporated.
• Cover the dough with plastic wrap and let it rest in the refrigerator for 1 hour to firm up.
• Flour the work surface lightly, roll out the dough with a rolling pin also dusted with flour, and create a sheet about 1 centimeter thick.
• Cut out shapes with Christmas-themed cookie cutters and place the cookies on a baking sheet lined with parchment paper, leaving space between them.
• Bake in a preheated oven at 180℃ (356℉) for only 13 minutes.
• When you take them out of the oven, they will be soft at first, but they will harden as they cool.
• Allow the cookies to cool completely and prepare the royal icing.

For the royal icing:

• Combine all the icing ingredients in a bowl and mix with a spoon until the ingredients are well combined.
• Transfer the icing to a piping bag with a thin tip and create designs.
• Finally, sprinkle with colored glitter to add a festive touch to your cookies.