Preheat oven to 350 degrees and spray a 9 x 5 bread pan with non stick spray.

Wrap grated zucchini in a paper towel and squeeze until some of the liquid releases. You don't need to completely dry it out. Just a tablespoon of liquid or so.

In a large bowl, combine flour, baking powder, baking soda and salt.

In a small bowl, combine milk and vinegar. The milk will curdle a bit. (you just made homemade buttermilk!) Mix in melted butter and egg.

Add milk mixture to dry mixture being careful not to over mix. (over mixing will make for a low rising bread).