Prepare. Preheat your oven to 350°F. Also, prep your baking sheets for nonstick. Parchment paper works in this recipe.
Dry Ingredients. In a medium bowl, use a whisk to combine together the flour, cocoa powder, baking soda, and salt.
Wet Ingredients. Using a large mixing bowl, beat together the softened butter, peanut butter, granulated sugar, and brown sugar on medium speed until light, fluffy, and smooth (about two to three minutes). Scrape down the sides of the bowl and then add the egg and vanilla extract. Beat the ingredients on medium speed for 30–60 seconds, just until fully combined.
Combine. Scrape down the sides of the bowl once again and then set the mixer speed on low. Gradually add the dry ingredient from the second step to the large mixing bowl and mix until just combined.
Chips. Lastly, gently fold in the chocolate chips.
Bake. Use a small cookie scoop to scoop out the dough and place the cookies about an inch and a half to two inches apart from one another on the baking sheets. Note, for larger cookies you can use a medium sized scoop but, be sure to place the cookies two inches apart from one another. Bake for 9–11 minutes, until the edges are set but the centers still look slightly soft.
Cool Let the cookies cool on the baking sheet for five minutes before transferring them to a wire cooling rack to finish cooling.