Heat oil in a pan. Add onions and fry till translucent.
Add tomatoes, turmeric powder, chili powder, fry till the tomatoes turn soft.
Move the onion and tomato masala to the sides of the pan, and add the sausages to the pan.
Fry the sausages on both sides.
Cover the sausages with the masala, put the lid on and, let them cook on low flame. Maybe around 25 to 30 minutes.
When the sausages are almost done, add the peppers on top, cover the pan and cook for a further 10 minutes till peppers have softened. Add salt to taste.
Mix it all up, if there is too much gravy, turn up the flame and cook till some of the gravy evaporates.
The consistency should be more like a masala than a gravy.
Enjoy your sausage and peppers with bread, rice, or paratha.