1 cup flour 1/2 teaspoon baking powder 1/8 teaspoon baking soda 1/4 teaspoon salt 1 cup packed light brown sugar 1/3 cup unsalted butter, melted 1 Tablespoon vanilla extract 1 large egg 1 1/2 cups assorted candy bars, chopped  Preheat oven to 350°. Line an 8-inch baking pan with aluminum foil, leaving an overhang on…

12 T. unsalted butter, plus more for pan 1 1/2 c. all-purpose flour 1 tsp. baking powder 1 c. light-brown sugar, firmly packed 2/3 c. granulated sugar 2 lg. eggs 1 tsp. pure vanilla extract 1 c. (6-oz.) butterscotch morsels Preheat oven to 350°. Butter a 9-inch-square cake pan, and set aside. In a medium…