Preheat your oven to 375°F (190°C).
Place halved peppers on a baking dish, cut side up. Drizzle with olive oil and roast for 10 minutes to soften slightly.
In a skillet over medium heat, cook ground beef until browned. Drain excess fat.
Add chopped onion and garlic to the beef. Sauté for 2-3 minutes until fragrant.
Stir in taco seasoning, salt, rice, beans, and corn. Mix well and heat through.
Remove peppers from oven and fill each with the beef mixture. Top with shredded cheese.
Return to the oven for another 10-15 minutes until cheese is bubbly.
Serve hot with cilantro and a squeeze of lime.