In a skillet over medium-high heat, cook the beef until browned. Drain excess fat.
Push the beef to one side, add sesame oil, and sauté the bell peppers and onions until slightly softened.
Stir in garlic powder and ground ginger, then mix everything together.
In a small bowl, whisk together soy sauce and hoisin sauce, then pour it over the beef mixture.
Let the sauce simmer for 2-3 minutes, ensuring everything is well coated.
Divide the cooked rice into bowls, top with the beef and pepper mixture, and garnish with green onions or sesame seeds.