Spray a square pan (8×8) with cooking spray and lightly flour it.
Whisk together melted margarine and sugar in a bowl. Add egg substitute and vanilla extract and whisk. Add flour, baking soda, baking powder, and salt, and mix well.
Add chocolate chips. Spread the batter evenly in the pan.
Bake for 20 minutes or until a toothpick comes out clean.