In a large pot over medium heat, drizzle in 2 tablespoons of olive oil. Once shimmering, add 1 diced medium onion, 2 diced carrots, and 2 diced celery stalks. Sauté for about 5-7 minutes, or until the vegetables soften and the onion becomes translucent.
Pour in 6 cups of chicken or vegetable broth into the pot, stirring gently to mix. Increase the heat and bring the mixture to a boil, allowing it to bubble and steam for about 5 minutes.
Once boiling, add 1 cup of pastina to the pot. Lower the heat to a gentle simmer and cook for 5-7 minutes, stirring occasionally.
After the pastina is cooked, fold in 1 cup of chopped spinach and sprinkle in 1 teaspoon of salt. Let the soup simmer for an additional 2-3 minutes until the spinach wilts.
Remove the pot from heat and ladle the hot Italian Pastina Soup into bowls. Pair it with crusty bread for a satisfying meal.
Notes
Store leftovers in an airtight container for up to 3 days, or freeze for up to 3 months. Reheat gently and add broth if thickened.