Awesome Lower Fat Brownies

Ingredients

• 14 cup margarine, room temperature
• 23 cup white sugar
• 1 teaspoon vanilla extract
• 1 large egg, room temperature
• 2 tablespoons low-fat sour cream
• 1 jar prune baby food (this will not affect flavour in any way - I promise!)
• 12 cup flour
• 12 cup cocoa powder (use a good quality!)
• 12 teaspoon baking powder
• 14 teaspoon baking soda
• 1 pinch salt
• 14 cup frozen mini chocolate chip (pre-freezing allows them to melt more slowly)