Cook pasta in a pan with water by adding 1tsp of oil.
After pasta is fully cooked, if there is excess water remove it.
Cut onion, tomato & bell peper into thin slices.
Each slice must be cut into 2 inch so that it doesn't look odd.
In a pan add olive oil. Heat it add onion fry till it is looking like glass,add tomato fry for 2 min,then add bell pepper fry for few min.
Then put pasta & add salt mix together.
Keep the flame in low ,then add pasta sauce. Mix everything together, keep in heat for 30sec.
If u wish u can add chicken peices which is cooked seperatly. This can be added after bell pepper.
Enjoy ur dinner