Place the chopped onion and Italian sausage in a large soup pot. Cook over medium heat until the sausage is browned.
If there is a lot of excess oil, drain that out of the pot.
Drain and rinse the canned beans, and add them to the pot.
Add the chicken stock. Raise the heat to high, and bring the soup to a boil.
Once the soup is boiling, add the orzo, garlic powder, and oregano.
Cook for 15 minutes. While the soup is cooking, chop the zucchini.
Add the zucchini to the pot, and cook for about 5 minutes. Season with salt and pepper as desired.
Notes
Store leftovers in the refrigerator. They should stay fresh for 3-4 days. If you don't have a brand of sausage that works for your needs, you can buy any ground pork, turkey, or chicken, and season it the way that you like.