Preheat oven to 350 degrees F. Spray an 8″x 8″ baking dish with cooking spray or coat it with oil.
Mix dry ingredients in the prepared baking dish. Make 3 depressions in dry ingredients (see photo). Add the vinegar in one depression, vanilla in the other and the vegetable oil in the third larger depression. Mix everything slightly and then pour water overall. Mix well until smooth. Do not over mix!
Bake for proximately 30 minutes or until cake is done (you can use the toothpick method but I like to push the center of the cake slightly with my fingers. If fluffy and it pushes back cake is done)
Mix the cinnamon and sugar for the topping and pour evenly over the still warm cake.
Allow to cook or NOT! We won't judge!