In a stand mixer fitted with the paddle attachment, cream butter, powdered sugar, vanilla, and salt until smooth.
1 cup unsalted butter, softened, ¾ cup powdered sugar, 1 teaspoon pure vanilla extract, 1 teaspoon salt
Gradually add flour and mix on low until combined.
2 ⅓ cups all-purpose flour
Add Andes baking chips and continue mixing on low until fully combined.
¾ cup Andes peppermint crunch baking chips
On wax paper or parchment paper, form into a 12- to 14-inch log and freeze at least 30 minutes or until firm.
When ready to bake, preheat oven to 350°F. Cut the shortbread dough into ¼ -inch slices and bake for 13 to 15 minutes on parchment lined baking sheets.
Cool on baking sheet for a couple of minutes, then transfer to a wire rack to cool completely before storing in an airtight container.
Notes
Decorating tips: If you want to make these even more festive, dip cookies halfway into melted chocolate and sprinkle with crushed candy canes.
Freezing dough: Dough logs can be frozen for up to three months. Wrap well and label. Allow the logs to warm up at room temperature for a half hour before slicing and baking as directed.