1. In a lsrge pot, over high heat, add the first 10 ingredients; stir to combine.
2. Bring to a boil.
3. Lower heat to medium-low, cover, and simmer for 1 hour, 15 minutes.
4. Add in the mushrooms and orzo.
5. Simmer covered for 10 more minutes.
6. Add in peas, stir; cook uncovered for about 10 more minutes or until ingredients are tender; adjust seasoning to taste.
7. Ladle into individual soup bowls and sprinkle with parmesan cheese.