Kielbasa Casserole

1 large green bell pepper, cut into 1/2-inch pieces (1/2 a green bell pepper, 1/2 a red bell pepper)
1 large sweet onion, cut into 1/2-inch pieces
1 lb kielbasa (or sausage), cut into thin diagonal slices
1 (28 ounce) can stewed tomatoes (fire roasted diced tomatoes)
1  cup converted white rice, uncooked
Seasonings of choice - to taste

Preheat oven to 375 degrees.
Combine all ingredients in a 2 1/2 to 3 quart casserole dish.
Bake covered for about 1 1/2 hours to 2 hours.
Top each serving with some butter, if desired