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White Vinegar • Flour • White Sugar • Baking Powder • Baking Soda • Salt • Egg • Cooking Spray • Butter, Melted • Milk

Peanut Butter • packed light-brown sugar • (1 stick) softened unsalted butter • egg • all purpose flour (spooned, levelled) • baking powder

all purpose flour • granulated white sugar • baking powder • salt • chilled, unsalted butter, cut into pieces • fresh blueberries (or chocolate chips, cranberries and so forth) • egg, lightly beaten • pure vanilla extract • milk or cream • milk or cream • brown sugar • all purpose flour •