Boil pasta,when cooked drain the water and keep aside.

Take a pan,add oil..add onion, saute it for sometime then add tomato and cook for sometime add little water and then add all sauce salt,green chilli and give a quick mix,

Add water and adjust the consistency it should be thick,then add grated cheese and mix it well,add red chilli powder(if needed),oregano, chilli flakes, black pepper and mix it well. Your pasta is ready. Grate cheese on top of it and enjoy.