Heat oven to 190º C.
Mix ingredients for cheese filling
Fry onion in oil until softened
Add garlic, tomatoes, chilli
Bring sauce to boil
Remove sauce from heat
Blend sauce
Put two large tablespoons of filling on a tortilla or crepe
Roll up
Put in a greased baking dish
Repeat until all done
Pour over the sauce
Sprinkle yellow cheese over the tortillas or crepes
Cover dish with tin foil
Bake at 190º C for 45 min
Remove tin foil
Bake for another 15 min.
Serve.