Heat oven to 180C/160C fan/gas 4.
Heat a non-stick frying pan, add the black
beans and fajita spice mix, stir together and
cook for 1-2 mins. Add the tomatoes and
simmer over a low heat for 10 mins.
Cut the tortillas in half. Lightly grease a
2-litre baking dish. Spread a third of the
bean mixture over the base of the dish,
followed by 3 tbsp of the cheese and a
layer of tortillas. Repeat the process,
finishing with a tortilla layer on top.
Sprinkle over the remaining cheese.
Bake for 15 mins until golden.