Preheat oven to 375 degrees F. Grease and flour a 8 x 8 inch baking dish or line it with parchment paper and grease the side of the dish with nonstick cooking spray.
Using a stand mixer or a large bowl and a hand mixer, cream softened butter and brown sugar.
Add egg, vanilla and water, and mix until blending, scraping down the sides with a spatula.
Add flour, baking soda and salt, and blend into the wet ingredients.
Stir in nuts and 1/2 cup chocolate chips.
Pour into prepared baking dish; sprinkle remaining chocolate chips over top.
Bake for 2 minutes; remove from the oven.
Using a knife, run the tip in a zigzag motion through the mix.
Return to the oven, and bake for an additional 20 to 25 minutes or until golden brown and a toothpick comes out clean.
Let cool before removing from the pan. Cut into chocolate chip cookie bars.