Place a large skillet over medium heat.
Add the lean ground beef to the skillet.
Cook the ground beef until fully browned, breaking it apart into small crumbles as it cooks.
Drain any excess grease from the skillet.
Add the chopped white onion, chopped green bell peppers, and minced garlic to the browned ground beef.
Cook for approximately 3 minutes, stirring occasionally, until the peppers begin to soften and the garlic becomes fragrant.
Add the tomato paste, beef broth, petite diced tomatoes, white long grain rice, salt, and ground black pepper to the skillet.
Stir well until the tomato paste is fully incorporated and the rice is evenly distributed.
Bring the mixture to a boil.
Allow the mixture to boil for 1 minute.
Reduce the heat to low.
Cover the skillet with a lid.
Simmer for 18 to 20 minutes, or until the rice is tender and most of the liquid has been absorbed.
Remove the lid and gently fluff the mixture with a fork.
Sprinkle the shredded Monterey Jack cheese evenly over the top of the skillet.
Cover the skillet again.
Turn off the heat.
Allow the skillet to rest, covered, until the cheese has melted.
Serve warm.