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