01 -
Heat oven to 350°F and line baking sheet with parchment paper.
02 -
Cream butter and sugar until fluffy, then mix in egg, yolk, and peppermint extract.
03 -
Mix in 6 drops food coloring, adding more if needed for desired shade.
04 -
Mix in flour, baking powder, and salt until combined.
05 -
Roll dough into 1-inch balls and place on cookie sheet.
06 -
Bake 7-9 minutes until just set but slightly underdone.
07 -
Let cool 2 minutes, press chocolate kiss into each cookie, then move to wire rack.