Pre-heat oven to 375°F. Rinse your rice well until water runs clear and set aside.
Chop peppers into bite-size pieces, roughly chop onion, and crush garlic. Set aside.
In a large skillet (that has a lid), heat olive oil over medium-high heat. Add ground beef and cook until crumbled.
Add peppers, onions, and garlic. Cook, stirring constantly, until peppers start to soften, about 5-7 minutes.
Add stock, and scrape the bottom of the pan to release the browned bits. Then add the rice, tomatoes, taco seasoning, and salt & pepper. Turn off heat and stir until completely mixed.
Cover with lid and put in the oven for 45 minutes.
After 45 minutes, remove from oven, take off the lid and cover the surface of the casserole with the shredded cheese. Return to the oven (without the lid) and cook for another 15 minutes, or until the cheese is melted, bubbling, and starting to brown. Watch it carefully, as the cheese time will depend on what kind of cheese you’re using!
Remove from oven and let sit for about 5 mintues before serving, scooping casserole into 6 bowls.
Optionally, you can garnish with chopped cilantro, or squeeze lime wedges over the casserole, or add dollops of sour cream. Or all three!
Enjoy!