Delicious Low Calorie Chocolate Cake
["1 1/2 c. flour", "1/3 c. cocoa", "1 tsp. baking soda", "6 Tbsp. light margarine", "1 c. sugar", "1 c. skim milk", "1 Tbsp. white vinegar", "1/2 tsp. vanilla extract"]
["Heat oven to 350\u00b0.", "Spray cake pan with nonstick cooking spray.", "In bowl, stir flour, cocoa and soda.", "In saucepan, melt margarine; stir in sugar.", "Remove from heat.", "Add milk, vinegar and vanilla to saucepan mixture; stir.", "Add dry ingredients and whisk until blended.", "Pour evenly into pan.", "Bake approximately 20 minutes."]
["flour", "cocoa", "baking soda", "light margarine", "sugar", "milk", "white vinegar", "vanilla extract"]