Preheat the oven to 350°F (175°C) and line baking sheets with parchment paper.
In a mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition. Then, stir in the peppermint and vanilla extracts.
In another bowl, whisk together the flour, baking soda, and salt. Gradually add the dry mixture to the wet mixture, stirring until combined.
Fold in the chocolate chips and crushed peppermint candies using a rubber spatula.
Drop tablespoon-sized portions of dough onto the prepared baking sheets, spacing them about 2 inches apart.
Bake in the preheated oven for 10-12 minutes or until the edges are lightly golden.
Remove from oven and sprinkle a few extra crushed peppermint candies on top of each cookie while they are still warm.
Allow the cookies to cool on the baking sheets for 5 minutes before transferring them to a cooling rack to cool completely.