Prep Time 15 minutes mins
Cook Time 12 minutes mins
Resting Time 30 minutes mins
Total Time 57 minutes mins
For the most tender shortbread, avoid overmixing once the flour is added to prevent gluten development. If the dough feels crumbly, squeeze it together with your hands; the warmth will help it come together without extra moisture. Crushing peppermint in a zip bag with a rolling pin minimizes sticky dust; sift out very fine powder if you prefer distinct candy bits. Keep dough thickness consistent for even baking and rotate the pan halfway through if your oven has hot spots. If using salted butter, omit the added salt. The white chocolate drizzle can be replaced with dark chocolate for contrast, and the cookies keep well in an airtight container for up to a week or can be frozen (undecorated) for 2 months.