For preparing pasta in tomato sauce, take a large vessel, pour water and boil.
Stir in pasta, required salt and cook for 20 minutes. Drain well and keep pasta aside.
In a pan, heat butter and fry onion, garlic, green chillies, tomatoes, capsicum and mushroom.
While sauting, add oregano, tomato puree, tomato sauce, required salt and pepper.
Mix corn flour in 1 cup water and pour it into the sauce to thicken the same.
Finally, add pasta and mix well to make a semi thick consistency.
Serve the pasta in tomato sauce recipe with shredded cheese on top.