Preheat the oven to 350 degrees Fahrenheit and line a baking sheet with parchment paper or a Silpat mat. Set baking sheet aside.
Sift the flour, cocoa powder, baking soda, baking powder, and salt in a medium-sized bowl. Set aside.
In a large mixing bowl, beat the butter, brown sugar, and granulated sugar using on medium-high-speed using an electric mixer. Beat for 2 minutes, until light and creamy.
Scrape the sides of the bowl, then add the egg, vanilla extract, and peppermint extract. Beat for an additional minute to completely combine.
Add the dry ingredients to the mixing bowl with wet ingredients. Mix on low speed until just combined. Then stir in the chocolate chips. The batter will be thick.
Use a large cookie scoop to portion into 3 tablespoon-sized balls.
Place cookie dough balls on a parchment-lined baking sheet at least 2 inches apart and bake for 7-9 minutes, until the top of the cookie has a dry appearance.
Remove from the oven. Immediately sprinkle crushed peppermints over the cookies. You can also press in additional chocolate chips, if desired.
Let the cookies cool on the cookie sheet for 5 minutes. Then transfer to a cooling rack and cool completely.