Wash peppers and slice off the tops. Remove all seeds and membranes from the inside.
Place peppers in a large pot and fill with water. Bring to a boil, remove from heat and let sit for 5 minutes. Remove peppers from water and set aside.
In a large saucepan, brown ground beef until cooked through and drain the fat.
Add rice, diced tomatoes, and taco seasoning to the meat. Mix until combined.
Place the peppers in an 8 x 8 inch baking dish and fill to the top with meat mixture.
Top with cheese and bake for 30 minutes or until peppers are soft and cheese is melted.