Combine broth, tomatoes, kidney beans, onion, carrots, celery, green beans, zucchini, garlic, parsley, oregano, salt, thyme, and pepper in a 6-quart slow cooker. Cover and cook on Low for 6 to 8 hours.
STEP 3
Bring a large pot of lightly salted water to a boil. Cook elbow macaroni until cooked through but firm to the bite, about 8 minutes; drain.
STEP 4
Stir macaroni and spinach into the slow cooker; cover and cook for 15 more minutes.
STEP 5
Ladle into bowls and sprinkle with Parmesan cheese.