Step 1

Preheat oven to 375F. Line two baking sheets with parchment paper.

Step 2

In a bowl, sift together flour, cocoa powder, baking soda, and salt.

Step 3

In a large mixing bowl or the bowl of a stand mixer fitted with the paddle attachment, beat butter and sugars on medium speed until very light and fluffy, about 3 minutes.

Step 4

Add egg and vanilla and beat until well combined, scraping down the sides of the bowl as needed.

Step 5

With the mixer on low speed, gradually add the flour mixture, mixing just until combined. Stir in the chocolate chips.

Step 6

Scoop 1½ tablespoon-sized balls of dough on the cookie sheet, place about 2 inches apart.

Step 7

Bake for 10 minutes or until cookie edges are firm and the center appears dry. Let cool on the sheets for 5 minutes. Transfer to wire racks to continue cooling. Store baked cookies in an airtight container for up to 5 days.