1Make the sauce in a bowl and set aside in the fridge.
2Line a large sheet pan, add chopped onions and bell peppers, spray with avocado oil and season with taco seasoning. Mix, spread evenly, and roast.
3Add lean ground beef on top with more taco seasoning, tomato paste, and chopped coriander. Mix well with your hands, flatten evenly, score lightly, and spray again.
4Bake at 180C / 370F. Break up the beef, return to the oven until lightly crisp. Add a splash of water and mix until juicy, then remove.
5Dip tortillas in the pan juices, fill with beef and cheese, and bake, flipping halfway, until golden and crispy.