Preheat your oven to 350°F (175°C). Line baking sheets with parchment paper.

In a medium bowl, combine all-purpose flour, unsweetened cocoa powder, baking soda, and salt. Whisk well.

In a large bowl, cream together softened butter, granulated sugar, and brown sugar until light and fluffy, about 3-4 minutes.

Beat in the eggs one at a time, then add vanilla extract and mix well.

Gradually add dry mixture to wet ingredients and mix just until combined.

Using a cookie scoop, roll dough into balls, about 1.5 ounces each, and place them on the baking sheet with space in between.

Gently press Mint M&M candies into each cookie dough ball.

Bake for 9 to 11 minutes until cookies are just set but soft in the center.

Cool cookies on the baking sheet for about 5 minutes before transferring to wire racks.