1cuppacked brown sugar ⅓cupbutter, melted 1largeegg, beaten 1tablespoonvanilla extract ⅔cupsemisweet chocolate chips Directions Gather the ingredients. Preheat the oven to 350 degrees F (180 degrees C). Grease a 9x9-inch baking pan. Sift together sifted flour, baking powder, salt, and ...