1. Preheat the oven to 400 degrees.

2. In a large bowl, mix together the butter, brown sugar, and egg.

3. When the above items are ready, stir in the milk and vanilla.

4. In a smaller bowl, mix the flour, baking soda, salt, and cocoa powder.

5. Pour the flour mixture into the large bowl with the other ingredients, and mix them well.

6. Add the chocolate chips, and stir them in to your dough.

7. Drop by rounded teaspoon evenly spaced onto a cookie sheet, and place into the oven.

8. Bake for 8-10 minutes.