Slice celery and carrots into ¼" slices
Dice onions and garlic
Heat oil at medium heat in medium sized pot, then add celery, onion, carrots, and garlic and heat for 5 min, stirring occasionally until vegetables soften
Add all other ingredients except Parmesan cheese and bring to a boil over high heat.
Turn down heat to medium low and cook, covered, for 15 min, or until pasta/grains are soft
If soup is too thick, add ½ cup more water
Ladle into bowls and sprinkle with Parmesan cheese