Bake 24 to 26 minutes or until toothpick inserted 2 inches from side of pan comes out clean or almost clean. Cool completely, about 1 hour. In small microwavable bowl, microwave frosting uncovered on High about 10 to 15 seconds or until drizzling consistency. Drizzle frosting over brownies. Sprinkle with 2/3 cup chopped cookies. For 20 brownies, cut into 5 rows by 4 rows.