Crispy Chocolate Cookies

Preheat the oven to 350 degrees F (175 degrees C). Line 2 baking sheets with parchment paper.

Combine butter, sugar, and egg in a bowl. Beat with an electric mixer until light and fluffy.

Mix flour, cocoa powder, baking soda, and salt together. Add to the butter mixture, 1 cup at a time, until evenly incorporated. Gradually beat in water, then vanilla extract.

Drop spoonfuls of the cookie dough onto the prepared baking sheets. Press gently to flatten the mounds of dough.

Bake in the preheated oven until firm, about 20 minutes. Cool for 3 minutes before removing from the baking sheets.