Heat the oil in a large non stick pan, when hot, cook the onion and garlic until tender.
Add the tomatoes, tomato paste, mushrooms, salt, pepper, and oregano. mix together. Simmer uncovered for 5 minutes.
Preheat your oven to 200° C (400° F), grease a 7x11 baking pan with butter.
In a mixing bowl, add the corn muffin mix and Parmesan cheese and mix together.
Prepare the corn muffin mix according to package instructions to make the batter.
Spread the batter evenly in the bottom of the baking pan.
Slice 3 or 4 of the sausage links and scatter over the batter.
Pour hot tomato mixture over the batter.
Bake for 25 minutes.
Arrange the remaining sausage links on top, bake for another 15 minutes.
Sprinkle with remaining cheese.
Serve with sides of your choice, enjoy.