Using a large bowl, mix together the flour, cocoa powder, baking soda, and salt. Set aside.
Using a standing mixer, beat the butter and both sugars together until light and fluffy.
Mix in the egg and beat well.
Beat in the milk, vanilla, and red velvet extract
Gradually add in the flour mixture and mix until combined.
Fold in the chocolate chips.
Chill the dough for an hour.
Preheat oven to 350 degrees
Using a cookie sheet fitted with parchment paper, drop teaspoon dollops of Nutella and freeze.
Take out 1 tablespoon of dough and place a frozen teaspoon of Nutella onto the dough.
Add another half tablespoon of dough over the Nutella and cover the dollop.
Roll the dough between your hands to form a ball.
Repeat the the remaining dough and Nutella. You may need to chill the dough again halfway through.
Bake the cookies for 9 - 10 minutes.
Using a microwave safe bowl, melt 1 cup of chocolate chips
Scoop melted chocolate into the piping bag
Cut the tip off and drizzle onto the cookie
Let chocolate harden before enjoying!