Preheat and Prepare:

• Preheat your oven to 350°F (175°C).
• Line baking sheets with parchment paper.

Mix Dry Ingredients:

• In a medium bowl, whisk together flour, baking powder, and salt. Set aside.

Cream Butter and Sugar:

• In a large bowl, beat together the butter and granulated sugar until light and fluffy.
• Add in the egg, vanilla extract, and peppermint extract. Mix until well combined.

Combine Ingredients:

• Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Divide and Color Dough:

• Divide the dough in half. Color one half with red food coloring, kneading until the color is even.

Form Cookies:

• Roll out the plain and red dough separately to about 1/4 inch thickness.
• Layer one on top of the other and gently roll them together to form a log. Twist gently to create a swirl.
• Cut the dough into shapes using a tree cookie cutter.

Bake:

• Arrange cookies on the prepared baking sheet.
• Bake for 8-10 minutes, or until the edges are firm but not browned.
• Remove from oven and let cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.

Prepare the Glaze:

• In a small bowl, mix powdered sugar, milk, and peppermint extract until smooth.
• Drizzle over the cooled cookies.

Decorate:

• Add sprinkles or edible glitter while the glaze is still wet.