In a large pot or Dutch oven, heat the oil over medium-high heat. Add the onions, celery, and 1 tsp salt, and cook until the onions are soft and translucent, about 5-7 minutes. Add the minced garlicand cook for another minute until fragrant.
Add the ground turkey plus another ¾ tsp salt black pepper, and red pepper flakes. Break up the turkey with a wooden spoon or spatula, and cook until browned and no longer pink, about 7-10 minutes.
Add the chopped butternut squash and potatoes. Pour in the chicken broth and bring to a boil, then reduce the heat to low and simmer until the vegetables are tender and cooked through, about 20 minutes.
Add the cream to the pot, and cook for another 2 minutes until the soup is heated through.
Add parsley flakes. Taste and adjust seasoning with additional salt, as needed (see note below). Ladle the soup into bowls and serve hot. Enjoy!