In a large pot, heat the olive oil over medium-high heat.
Add the diced chicken and cook until browned, about 5 minutes.
Remove the chicken from the pot and set it aside.
Add the onions and garlic to the pot and cook until they’re softened, about 3 minutes.
Add the carrots and celery to the pot and cook for another 5 minutes.
Add the dried thyme and oregano to the pot and cook for 1 minute.
Add the chicken broth, water, potatoes, and frozen peas to the pot.
Bring the soup to a boil, then reduce the heat and let it simmer for 20-25 minutes, or until the vegetables are tender.
Add the cooked chicken back to the pot and let it heat through.
Season with salt and pepper to taste.