Vegetable Soup with Kielbasa

1 onion, chopped (1 cup)
8 ounce kielbasa, 1/4 inch pieces
2 cans tomato soup
1 can cannellini beans 15.5 ounce
1 package frozen mixed vegetables, thawed
1 package frozen spinach, thawed

In large pot heat 1 tablespoon oil over medium heat. Add onion and kielbasa; cook stirring until browned 10 minutes. Stir in soup, 2 cup water and beans; bring to a boil. Reduce heat to medium-low, cover and cook 10 minutes. Stir in mixed vegetables, spinach and 1/4 teaspoon pepper. Cover, cook until heated through 10 minutes adding additional water if soup is too thick.