
Season the beef chuck chunks with salt and pepper.
Layer ingredients: Add the beef to the slow cooker. Then, add sliced onions, minced garlic, and grated ginger on top.
Add liquid: Pour in the beef broth and water, followed by soy sauce, sesame oil, and brown sugar. Stir gently to combine.
Set slow cooker: Cover and set your slow cooker to low for 8 hours or high for 4 hours.
Let it cook until the beef is tender and easily shredded.
Prepare noodles: About 10 minutes before serving, cook the ramen noodles according to package instructions in a separate pot.
Add vegetables: Stir in the baby spinach into the slow cooker just before serving, allowing it to wilt slightly.
Serve: Ladle the beef and broth over the cooked ramen noodles in bowls.
Garnish: Top with green onions and optional soft-boiled eggs. Drizzle with Sriracha or chili oil for added spice, if desired.