Preheat oven to 350 degrees
Grease an 8 x 8 pan
In one bowl combine the first 6 dry ingredients
In another bowl mix together the milk, oil, egg, vinegar and vanilla.
Add dry ingredients into wet ingredients.
Mix until combined
Pour into prepared pan
Sprinkle with chocolate chips.
Bake for 30-35 minutes or until a toothpick comes out clean.