Preheat oven to 375°F. Prepare bell peppers by cutting off the tops and removing seeds and membranes.

In a skillet, cook ground beef over medium heat until browned. Add diced onion and minced garlic; cook until onion is translucent.

Mix cooked rice, chopped tomatoes, salt, pepper, and cooked beef mixture in a bowl.

Stuff each bell pepper with the beef and rice mixture. Place stuffed peppers in a baking dish.

Top each stuffed pepper with shredded cheese.

Bake in the preheated oven for 30-40 minutes until peppers are tender and cheese is melted and bubbly.