8 tablespoons (1 stick) unsalted butter, cut into pieces, plus additional for the pan 4 oz. unsweetened chocolate, chopped 1 cup all-purpose flour 1/2 teaspoon baking powder 1/2 teaspoon salt 2 large eggs 1 1/4 cup granulated sugar 1 teaspoon vanilla extract 16 small chocolate covered caramels or 16 pieces of Rolo candy, halved Directions Preheat oven to 325 degrees. Line an 8x8x2-inch baking…