3. Brown the Beef
Add ground beef to the skillet, breaking it apart with a spatula. Cook for 6–8 minutes, until browned and no longer pink. Drain excess fat if necessary.
4. Mix the Sauce
In a small bowl, whisk together soy sauce, hoisin sauce, brown sugar, sesame oil, black pepper, and red pepper flakes (if using). Pour this sauce over the beef and stir well. Simmer for 2–3 minutes, until slightly thickened.
5. Add the Peppers
Stir in the sliced red and green bell peppers. Cook for 4–5 minutes, until tender-crisp but still colorful.
6. Build Your Bowl
Spoon rice into bowls and top with the beef-and-pepper mixture. Garnish with green onions, sesame seeds, and an optional drizzle of sriracha or chili oil for extra heat.