Italian Meatball Soup Rapido

Ingredients

• 1/4 cup olive oil
• 1 cup onions frozen chopped, about 6 ounces
• 4 garlic cloves chopped
• 1 celery rib halved lengthwise and thinly sliced crosswise
• 2 carrots halved lengthwise and thinly sliced crosswise
• 5 1/4 cups reduced sodium chicken broth 42 fl ounces
• 2 1/2 cups water
• 20 precooked meatballs refrigerated or frozen, 15 to 20 ounces
• 28 ounces small white beans drained and rinsed
• 6 ounces baby spinach coarsely chopped
• 1/2 cup parmigiano-reggiano finely grated
• 3/4 teaspoon salt or to taste
• 1/4 teaspoon black pepper