Found the ideal snack the other day in Tescos.
Old El Paso Nachos kit, some mexicana cheese and some chicken.
Stir fry the chicken, layer the nachos, the tomato sauce, the chicken and the mexicana cheese (should be grated but I find it easier to just slice it)
Stick it in the oven for 5-10 minutes at 180.
Voila. My favourite snack of the week.
I guess you could do the same with doritos instead of El Paso nachos and make your own spicy tomato sauce - I'll leave it to some one with more culinary expertise to devise a suitable sauce