These veggie fajitas are packed with sweet bell pepper and red onion. Creamy avocado and warm tortillas complete the meal. The veggies alone make a great meal-prep recipe to have on hand. Serve them over rice, or heat them up over tortilla chips topped with melting cheese. To get a little char on your tortillas, place them over a medium gas flame and cook until darkened in spots, flipping once. Place on a plate and cover with a clean kitchen towel to keep warm.