In a soup pot, warm olive oil over medium heat. Add sausage and cook, stirring until browned all over, about 5 minutes. Transfer to a paper towel lined plate to drain. Discard all but 1 tbs of fat from pot.
Add onion and garlic to pan and cook stirring often, until soft, about 3 minutes.
Return sausage to pot and add chicken broth, 3 cups water and beans. Bring to a boil, reduce heat to low and simmer 15 minutes.
Stir in spinach until wilted, 1 to 2 minutes.
Season with salt (if you desire0 A ndpep per) and pepper.