01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, baking soda, and salt until evenly mixed.
03 - In a large bowl, beat butter, granulated sugar, and brown sugar until light and fluffy, about 2 to 3 minutes.
04 - Add eggs one at a time, beating well after each addition. Stir in vanilla and peppermint extracts.
05 - Gradually add the dry ingredient mixture to the wet mixture, mixing just until incorporated.
06 - Fold in semisweet chocolate chips, white chocolate chips if using, chopped mint leaves, and crushed peppermint candies.
07 - Scoop tablespoon-sized portions of dough onto prepared baking sheets, spacing about 2 inches apart.
08 - Bake for 9 to 11 minutes, or until edges are lightly golden and centers remain soft.
09 - Allow cookies to cool on baking sheets for 5 minutes before transferring to wire racks to cool completely.