01 - Lightly coat the inside of your slow cooker with nonstick cooking spray to prevent sticking.
02 - Arrange the thinly sliced flank steak evenly in the bottom of the slow cooker.
03 - Whisk together soy sauce, brown sugar, hoisin sauce, and minced garlic in a medium bowl until sugar is mostly dissolved.
04 - Pour the sauce mixture over the beef and toss thoroughly to coat all pieces evenly.
05 - Cover and cook on LOW setting for 4 hours until beef is tender and sauce has thickened slightly.
06 - Stir well before serving. Serve hot over steamed rice or accompanied by steamed vegetables.