Beat eggs and mix in oil. Sift together flour and sugar, soda and cinnamon. Turn wet ingredients into dry adding vanilla. Add in zucchini and nuts. Butter and flour a 13x9 inch baking pan. Pour batter into pan. Bake at 350 for 25-30 mins.
Cool brownies. I find it's best to ice the brownies in the pan and keep them fresh in the refrigerator.