Slice the chicken breasts horizontally (parallel to the board), – so you get 2 thin, flat fillets from each breast.
Toss them in the taco seasoning so they are completely coated.
Heat a frying pan over a medium heat and fry the chicken in a generous splash of oil for 3-4 minutes on each side, depending on thickness. Cook them over a slightly lower heat rather than too high, so the spices don't burn.Always check that the chicken is cooked through.
Drain the beans and mix all the salad ingredients together.
Warm your tortillas as directed on the packet, and meanwhile cut the chicken into strips.
Top your tortillas with crème fraîche, salsa, salad and chicken.
If you like, serve with finely chopped fresh jalapeños on top, or a sprinkle of chilli flakes.