Combine flour, brown sugar, white sugar, salt, and cocoa powder in a bowl.
Add butter, milk, egg, and vanilla extract. Mix until dough becomes soft.
Drop spoonfuls of dough onto baking sheet, spaced about 1 inch apart.
Place chocolate chips on top of each cookie.
Bake for 8-10 minutes until golden.
Note: These cookies are perfect for any occasion! They're rich and decadent, but you can customize the recipe by adding shredded coconut, pumpkin puree, or cinnamon.