Brownies
1 cup butter or margarine
1 cup granulated sugar
1 cup packed brown sugar
2 teaspoons vanilla
4 eggs
1¼ cups Gold Medal® all-purpose flour
¾ cup unsweetened baking cocoa
¼ teaspoon salt
1 cup semisweet chocolate chunks
1 cup white chocolate chips or chunks
Frosting
1½ cups powdered sugar
¼ cup unsweetened baking cocoa
¼ cup butter or margarine, softened
2 to 3 tablespoons milk
½ cup white chocolate chips or chunks
1 teaspoon vegetable oil