Frosted Oreo Cookies

Preheat oven to 350°F, and line a baking tray with parchment paper. Set aside. In a medium bowl, whisk together the flour, baking soda, salt and cocoa powder. In a medium-sized bowl, beat together the butter, brown sugar, and granulated sugar on medium speed for 1 minute or until combined. Mix in egg and vanilla extract. Add the dry ingredients to the wet, and mix until well-combined. Scoop dough and place on prepared baking sheet. Bake for 12-14 minutes or until cookies no longer look doughy in the center. Cool completely on the pan. To make frosting: Beat the butter, cream cheese and vanilla extract on high speed for 1-2 minutes until combined. Turn the mixer to low speed then slowly add the powdered sugar. Beat on high for 1-2 minutes until creamy and the frosting is at a good consistency to pipe. Spread or pipe on cooled cookies. Garnish with crushed Oreos!