01 - Lightly coat the interior of your slow cooker with nonstick cooking spray to prevent sticking.
02 - Place the thinly sliced flank steak pieces in the bottom of the prepared slow cooker.
03 - In a medium mixing bowl, whisk together the soy sauce, brown sugar, hoisin sauce, and minced garlic until the brown sugar is mostly dissolved and the mixture is well combined.
04 - Pour the sauce mixture evenly over the beef. Toss the meat thoroughly to ensure every piece is coated with the sauce.
05 - Cover and cook on LOW setting for 4 hours, or until the beef is fork-tender and the sauce has slightly thickened.
06 - Stir the beef and sauce well before serving. Serve hot over steamed jasmine rice or alongside steamed vegetables.