Place the stew meat into a 6-quart slow cooker.
Season the beef with the black pepper and garlic powder.
Add the sesame oil, onion, and garlic over the beef.
In a bowl, whisk together the beef broth, soy sauce, brown sugar, oyster sauce, and Worcestershire sauce.
Pour the sauce mixture over the beef.
Cover and cook on LOW for 6–7 hours or HIGH for 4–5 hours, until the beef is tender.
About 30 minutes before serving, cook the eggs.
Melt the butter in a skillet over medium heat.
Add the eggs and scramble until fully cooked.
Add the frozen peas and carrots to the slow cooker.
Stir in the cooked rice and scrambled eggs.
Drizzle in the remaining soy sauce and sesame oil.
Gently stir until everything is evenly combined.
Cover and cook for another 20–30 minutes until heated through.
Sprinkle with sliced green onions before serving.