Preheat oven to 180, grease square or rectangular dish
Heat oil in a pan, saute onions until soft
Add green chillies, pepper and salt, saute for few seconds
Add chicken and mix well. Cook for 8-9 minutes. Keep it aside
Place tortilla on a plate, apply sauce all over tortilla. Add spoonful of black beans, chicken and 1 tbsp cheese in centre
Roll the tortillas and placs in greased pan. Do until all tortillas are completed
Add remaining sauce on top of tortillas
Sprinkle remaining cheese on top
Bake for 15-20 minutes. Garnish with cilantro and serve warm