Preheat oven to 400°F (200°C).

Cut sausages into bite-sized pieces and remove casings.

Bake cut up sausages for about 20 minutes.

While sausage is cooking, add olive oil and sliced onion to a large skillet.

Sauté onion until translucent.

Once sausage is done baking, add it to the skillet with the onions.

Add tomato sauce to the skillet.

Cook for 20 minutes.

Add the sliced green bell peppers to the skillet.

Cook for an additional 20 minutes, until peppers are tender.

Serve over rice.