I had an 8x8 pan and I cooked it an additional 15 mins and it looks wonderful and cooked through perfectly... except my substitution didn't work... I'm allergic to red grapes, so can not use baking powder (long list of leveners are made with grapes) and have always subbed baking powder for apple cider vinegar
with equal parts baking soda.
Make your own toothpaste in a mason far
with equal parts baking soda and coconut oil and food - grade essential oil of choice, such as peppermint or spearmint.