There is just something so exciting about cookie dough. Imagine the excitement when it's sandwiched between two rich chocolate cookies!
Preheat oven to 350°F. Place parchment paper on a cookie sheet. Set aside.
In the large bowl of a stand mixer, add the butter and sugar. Cream together until blended.
Add the cocoa powder, flour, baking soda, and salt. Turn the mixer on low and continue mixing until incorporated.
Using a small cookie scoop or ice cream scoop, place chocolate cookie dough on the prepared baking sheet, roughly 2 inches apart. They will spread out while baking.
Remove to a wire rack to cool while you prepare the cookie dough frosting.
Beat brown sugar and butter together in a stand mixer on medium speed until smooth and creamy.
Add in flour, vanilla extract, and salt into creamed butter until fully combined.
With the mixer on low speed, and in milk 1 tablespoon at a time until fully incorporated.
Remove bowl from mixer and add in mini chocolate chips. Stir by hand until incorporated.
Allow cookies to cool completely before assembly.
Use a small cookie scoop (or a tablespoon) to place the frosting on the bottom side of one cookie.
Place a second cookie on top of the frosting, pressing down lightly. Enjoy!