Begin by heating your large skillet over medium heat. Add the ground beef and cook until browned, breaking it apart with your spatula. Once the beef is nearly cooked through, add the chopped yellow onion and minced garlic. Sauté together until the onion becomes translucent and fragrant.
Stir in the chopped red bell pepper and broccoli florets, cooking for about 3-4 minutes until they start to soften.
Once the vegetables have softened, add the jasmine rice to the skillet. Stir well to combine everything and allow the rice to toast slightly for about 1 minute.
Carefully pour in the beef broth and teriyaki sauce. Stir to combine, ensuring that all the rice is submerged in the liquid. Bring the mixture to a gentle boil.
Reduce the heat to low, cover the skillet, and let it simmer for about 20 minutes. Keep an eye on it, and stir occasionally to prevent sticking.
After 20 minutes, remove the skillet from heat and let it sit for an additional 5 minutes, still covered. Finally, uncover, fluff the rice with a fork, and garnish with chopped green onions. Serve hot with a drizzle of spicy mayo and extra teriyaki sauce if desired!