Preheat your oven to 350°F and line your baking sheets with parchment paper right now.
Chop peppermint pieces into small bits until you have one-third cup of crushed peppermint pieces.
Cream softened butter and sugar in your big bowl until the mixture is light and super fluffy.
Beat in the egg and vanilla extract until everything is mixed together smoothly in your bowl now.
Add flour, baking soda, and salt to the wet ingredients and mix until combined but not too much.
Gently fold white chocolate chips into the dough, so they're spread out evenly in all your dough.
Roll the dough into 18 balls that are about 1.5 to 2 inches around each one.
Dip the top of each ball into crushed peppermint and press gently so the pieces stick on really well.
Put coated dough balls on your prepared baking sheets with some space between each cookie ball.
Bake for 10 minutes until edges are set, but centers still look a little bit soft.
Let cookies rest on the baking sheet for 1 minute before you move them to the rack carefully.
Move cookies to your wire cooling rack and let them cool for 10 minutes before eating them.
Serve them warm or at room temperature and enjoy these tasty holiday cookies with everyone!