Prepare ingredients and tools.
In a mixing bowl, stir together oil, egg, water, and brownie mix.
Mix well until well combined then fold in half of the chocolate chips and nuts.
Using a small scooper, scoop out the cookie dough and lightly press the dough to flatten it.
Bake in a preheated 350F/177C oven for 8-10 minutes or until the cookies are set. Cool slightly on the cookie sheet, serve and enjoy!