01 - Set oven to 350°F (175°C) and line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together all-purpose flour, cocoa powder, baking soda, and salt until evenly mixed.
03 - In a large bowl, beat softened butter with granulated and brown sugars until light and creamy, approximately 2 to 3 minutes.
04 - Add eggs one at a time, mixing thoroughly after each addition, then blend in vanilla and peppermint extracts.
05 - Gradually add the dry ingredient mixture into the wet ingredients, stirring just until fully combined.
06 - Fold in semisweet chocolate chips and half of the crushed peppermint candies gently to maintain texture.
07 - Drop tablespoon-sized dough balls onto the prepared baking sheets, spacing each approximately 2 inches apart.
08 - Gently flatten each dough portion and sprinkle with the remaining crushed peppermint candies.
09 - Bake for 10 to 12 minutes, or until edges are set and centers remain soft.
10 - Allow cookies to rest on the baking sheets for 5 minutes before transferring to a wire rack to cool completely.