Preheat oven to 375°F.
Spray a small baking pan (8x12) with vegetable spray or Baker's Joy.
Combine dry ingredients directly in the pan. Mix all the wet ingredients
In a small bowl, combine remaining ingredients leaving out the vinegar until the final step.
Combine wet and dry ingredients, stirring together in pan until well combined. Stir in the vinegar rapidly and immediately place pan into preheated oven and bake for 25 to 30 min.
Optional: You can stir in 1/2 cup semi-sweet chocolate chips just before baking to make a richer cake with melted chocolate bits or swirls.
