Preheat your oven to 350°F (177°C) and cover several baking sheets with parchment paper.
In an electric stand mixer* fitted with the paddle attachment, cream butter, brown sugar, vanilla and cinnamon and mix on medium for 4 minutes, or until lightened in color and texture. Scrape down the sides and bottom of the bowl to make sure everything is incorporated. With the mixer on low add the eggs one at a time, completely mixing the first before adding the next, and then add in the water, salt, baking powder and baking soda and mix for 1 minute more, or until well blended.
Add the flour and oats and mix until the cookie dough is almost blended. You’ll still see streaks of flour. Add the chocolate and mix for 1 minute more, or until the chocolate is evenly distributed throughout the dough. Roll 3-tablespoon-sized balls and allow 2-inches (5-cm) between them on the prepared baking sheet.
Bake cookies, one sheet at a time, in the center of the oven for 13 minutes. Allow the cookies to cool on the baking sheet for 20 minutes and then move to a cooling rack to finish cooling down.