Preheat your oven to 350°F and line 2 baking sheets with parchment paper.

In a large mixing bowl, cream the softened butter and brown sugar together until light and fluffy, about 2 minutes.

Add in the egg and vanilla extract and mix until fully incorporated.

In a separate bowl, whisk together the flour, cocoa powder, baking soda, baking powder, and salt. Slowly add the dry ingredients to the wet ingredients, mixing until just combined.

Fold the Reese’s Pieces candies into the cookie dough.

Use a ¼ cup cookie scoop or spoon to portion out the cookie dough to roll into a uniform ¼ cup ball.

Top cookie dough balls with extra Reese’s Pieces.

Place 6 cookie dough balls onto the prepared baking sheet, leaving about 2 inches between each cookie.

Bake for 10-12 minutes. Bake for 10 minutes if you want a slightly underbaked cookie. Bake 12 minutes for a slightly crispy and chewy cookie. And remember, cookies will continue baking while they cool.

Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack or tray to cool completely.