Preheat oven to 325º
In a large skillet, heat olive oil and cook ground beef, onion, and garlic. Add fajita seasoning and mix well during the cooking process. Once ground beef is cooked, drain excess grease from skillet.
Cut peppers in half (lengthwise), removing seeds and ribs. Fill pepper halves with rice and beef as desired.
Take one can of enchilada sauce and pour evenly over a baking sheet. Place filled peppers on a baking dish, on top of the enchilada sauce. Take the second can of enchilada sauce and pour over peppers.
Cover dish with tinfoil and bake for 45 minutes or until peppers are fork tender.