In a large pot, heat the olive oil over medium heat.
Add the diced onion and sauté until translucent, about 5 minutes.
Stir in the minced garlic, diced carrots, and diced celery. Cook for another 3-4 minutes, until the vegetables begin to soften.
Pour in the chicken broth and bring to a boil.
Add the shredded chicken, frozen peas, dried basil, and dried oregano. Stir well.
Once the soup reaches a rapid boil, reduce the heat and add the cheese tortellini. Cook according to package instructions (usually 3-5 minutes), or until the tortellini float to the top.
Season with salt and pepper to taste.
Remove from heat and let the soup sit for a couple of minutes to cool slightly.
Serve hot, garnished with freshly chopped parsley on top.