Prepare peppers by cutting off tops and removing seeds.
In a large mixing bowl, combine rice, chicken, beans, onion, and cilantro.
In a separate small bowl, combine fajita seasoning mix, 2 Tbsp. oil, and 1/4 c. water.
Pour seasoning mixture over rice mixture and stir to combine.
Fill peppers to the top with rice mixture.
Place in a shallow oven-proof dish and sprinkle with shredded cheese.
Combine remaining fajita seasoning mix, 2 Tbsp. oil, and 1/2 c. water in a small bowl.
Pour into baking dish surrounding peppers.
Cover peppers with foil and bake at 400 degrees for 30 minutes.
Spoon sauce from pan over peppers before serving.