In a large bowl, whisk together the flour and ¾ cup of granulated sugar until well mixed.
Using a pastry blender or your fingertips, work the cold, cubed butter into the flour mixture until it resembles fine crumbs. This step is key for that classic shortbread texture!
Stir in your chosen extract, the optional red food coloring, and the Andes Peppermint Crunch chips.
Now, use your hands to gently knead the mixture. Keep working it until the dough comes together into a smooth, firm ball. It might take a few minutes, but it will get there!
Shape the dough into a log, about 2 inches in diameter. Wrap it tightly in plastic wrap and refrigerate for at least 2 hours. This chilling time helps the cookies hold their shape perfectly.
When you're ready to bake, preheat your oven to 325°F (160°C). Line a baking sheet with parchment paper.
If you like, roll the chilled dough log in a little extra granulated sugar for a beautiful sparkle. Carefully slice the dough into ¼-inch thick rounds and place them on your prepared baking sheet.
Bake for 10-12 minutes, or just until the cookies are lightly set and the edges look firm. Be careful not to over-bake; they shouldn't turn brown.
Let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack to cool down completely.