Kielbasa Potato Soup without bacon tomatoes

1 (10 3/4 ounce) can condensed cream of mushroom soup or 1 (10 3/4 ounce) can cheddar cheese soup, I use the cheddar cheese soup 1 large onion , sliced 1 cup[...]

1 (5 1/4 ounce) package scalloped potatoes mix 2 cups boiling water 2 tablespoons butter or 2 tablespoons margarine 2/3 cup milk (I use 3/4 cup milk) 6 medium[...]

1 lb Polish sausage , sliced (Hillshire Farm's Polska Kielbasa or other smoked sausage) 1/2 cup butter , plus extra virgin olive oil , for pan 1 1/2 large[...]