1Heat oven to 350°F (325°F for dark or nonstick pan). Grease bottom only of 13x9-inch pan with shortening or cooking spray. Make brownies as directed on box. Cool at least 30 minutes. For 12 brownies, cut into 4 rows by 3 rows.
2Top each brownie with 1/3 cup ice cream; drizzle with 1 tablespoon chocolate syrup.