Slow Cooker Meatball Vegetable Soup

small meatballs (store bought or homemade)

jar of pasta sauce (about 2.5 cups)

low sodium chicken broth

carrots, peeled and chopped

green beans, ends cut off and cut into bite-sized pieces

medium-sized zucchini, ends cut off and cut into bite-sized pieces

medium-sized yellow onion, diced (about 1 cup)