Creating Slow Cooker Korean Beef is simple when you follow these easy steps:

1. Prepare the Beef: Trim any excess fat from the beef chuck roast and cut it into bite-sized pieces.
2. Mix the Sauce: In a bowl, whisk together the soy sauce, brown sugar, sesame oil, minced garlic, grated ginger, rice vinegar, and red pepper flakes.
3. Combine in Slow Cooker: Place the beef pieces in the slow cooker and pour the sauce mixture over the top. Stir to coat the beef evenly.
4. Set Cooking Time: Cover the slow cooker and set it to cook on low for 6-8 hours or high for 3-4 hours, until the beef is tender.
5. Shred the Beef: Once cooked, use two forks to shred the beef into bite-sized pieces if desired. Stir the beef into the sauce to combine.
6. Adjust Seasoning: Taste the sauce and adjust the seasoning, adding more soy sauce or red pepper flakes if needed.
7. Serve: Serve the Korean beef over cooked rice or noodles. Garnish with chopped green onions and sesame seeds for added flavor and presentation.

These steps will guide you in creating this incredible dish effortlessly.