Dorie Greenspan's Peanuttiest Blondies

Ingredients 1 cup AP flour 1/2 t baking powder 1/4 t baking soda 1/4 t salt 1/2 t cinnamon 1/2 cup peanut butter 5 T unsalted butter 3/4 cup sugar 3/4 cup packed light brown sugar 2 large eggs 1/2 t....