In a skillet over medium heat, add the olive oil. Once hot, add chopped onions and minced garlic. Sauté for about 3-4 minutes until they are soft and fragrant. Transfer to the crockpot.
In the crockpot, add the shredded turkey, diced potatoes, frozen mixed vegetables, chicken broth, heavy cream, thyme, rosemary, parsley, salt, and black pepper. Stir gently to combine all ingredients.
Cover the crockpot with its lid and set it on low for 6 to 8 hours, or high for 3 to 4 hours, until the potatoes are tender.
About 30 minutes before serving, add the frozen pie crust dough balls to the soup. Stir gently to incorporate them into the soup.
Once the soup is ready, taste and adjust seasoning if necessary. Ladle the soup into bowls and garnish with fresh parsley if desired. Serve warm with your favorite bread.