Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy, about 3-4 minutes.
Add the eggs, vanilla extract, and peppermint extract to the mixture. Beat well until combined.
In a separate bowl, whisk together the all-purpose flour, baking soda, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Gently fold in the crushed peppermint candies and white chocolate chips (if using).
Drop tablespoon-sized balls of dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake for 10-12 minutes, or until the edges are lightly golden and the centers look set.
Remove from the oven and let the cookies cool on the baking sheet for 5 minutes before transferring them to a cooling rack.
Once cooled, sprinkle additional crushed peppermint candies on top for garnish, if desired.