Preheat the oven to 350F degrees. In a large bowl, cream together the butter, sugar, cocoa powder, egg, and water until combined.
1 cup butter, softened, 1 cup sugar, 1 egg, 2 Tablespoons water, 1/2 cup cocoa powder
To the same bowl add the flour, baking soda, salt, oats and chocolate chips. Mix ingredients until a thick dough forms.
1 cup flour, 1/2 teaspoon baking soda, 1/2 teaspoon salt, 3 cups old fashioned rolled oats, 2 cups chocolate chips, dark or semi-sweet
Using a 1 ½ Tablespoon cookie dough scoop, form the dough into balls and place on a cookie sheet lined with parchment paper or sprayed with non-stick cooking spray.
Bake for 10-12 minutes or until the tops of cookies are just set and a little hardened to the touch. The inside of the cookies will still be quite soft. Be careful to not over bake them.
Remove the cookies from the cookie sheet after 5 minutes and allow to fully cool on the baking rack. Store at room temperature in an airtight container for up to a week.