Preheat oven to 350F. Line two baking sheets with parchment paper.
In a bowl, sift together flour, cocoa powder, baking soda, and salt.
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.
Add egg, instant espresso and vanilla and beat until well combined, scraping down the sides of the bowl as needed.
With the mixer on low speed, gradually add the flour mixture, mixing just until combined. Stir in the chocolate chips.
Use a cookie scoop or small ice cream scoop to scoop uniform balls of dough onto the cookie sheet.
Grab your cookie dough ball and press it into the plate filled with m&m's. Be sure to press all those m&m's into the top the cookie.
Place the cookies in the freezer for 15 minutes.
Once ready to bake, place the cookies on a parchment lined cookie sheet and space them atleast 2 and a half inches apart.
Bake for 13-15 minutes or until cookie edges are firm and the center appears dry. Let cool on the sheets for 5 minutes.
While the cookies are still warm, add a chocolate chip to the top of the cookie. Once the chocolate starts to melt, add the candy eye over the melted chocolate chip. The chocolate will act as a glue for the candy eye once it dries.
Transfer to wire racks to continue cooling.