Preheat the oven to 350 degrees.
In the mixing bowl of a stand mixer, add the butter, sugar and brown sugar. Mix until smooth and creamy, and no lumps remain.
Add eggs and vanilla. Mix well.
Place baking soda in the hot water, and dissolve. Then add to mixture.
In a separate bowl, blend together the flour, salt, cocoa, and chocolate chips. Add to mixing bowl, and on low speed blend all the ingredients.
Roll cookie dough into large balls, and place each ball in a muffin tin compartment.
Put muffin tin in the oven, and let dough bake for 15 minutes. Remove.
With a shot glass, press down the center of each cookie dough ball, pressing up the sides to form a cookie cup. The dough will stick to the shot glass. Gently push dough off of the shot glass and onto a wire rack to cool. Repeat until all the dough has been used.