A store brand Brownie Mix  ( they usually have less F-t)
For fudgey brownies: 
To substitute eggs, oil and water :Add 8 oz. plain yoghurt and 4 oz. skim
milk or soy milk(You can add 1/2 tesp of baking soda or powder if you want it
to rise more) For a treat, sprinkle 2 tbsp. of low fat chocolate bits  over
batter.  Bake as usual.
For cakey brownies:
To substitute eggs, oil, and water : Add 3 egg whites, and 1/4 c. applesauce.