Southwest Beef Sandwiches

Cut beef flank steak into 6 pieces; set aside. In 3 1/2 or 4-quart slow cooker, combine all remaining ingredients except buns. Add beef; mix well.

Cover; cook on high setting for 4 hours or until beef is tender. * Remove beef from slow cooker. Shred beef; return to slow cooker and mix well.

To serve, fill each bun with 1/3 to 1/2 cup beef mixture. If desired, top with shredded cheese or sour cream.

TIP: *If desired, beef mixture can be cooked on low setting for at least 8 hours or until beef is tender.