Quick bread formula?
Yes, from the book Ratio: The Simple Codes Behind the Craft of Everyday Cooking by Michael Ruhlman


  Quick Bread = 2 parts flour: 2 parts liquid: 1 part egg: 1 part butter...Recipes vary considerably on how much baking powder to use. I've found that a good working rule is one teaspoon per 4 ounces of flour (a scant cup), or 5 grams for every 110 grams of flour.