In a bowl, add minced turkey and spices. Mix everything well and set it aside.
Chop the onion and carrot into small pieces. Peel the potatoes and cut them into 1 cm cubes.
Heat a large pot over medium heat. Add the butter and oil.
Once the butter has melted, add the diced onion and cook for about 1 minute until it starts to soften.
Add the diced carrot and cook for an additional 5 minutes.
Pour the chicken stock into the pot. Bring the mixture to a boil.
Once the mixture is boiling, add the cubed potatoes and bay leaf. Reduce the heat to low and simmer for 8 minutes.
While the soup is simmering, shape the turkey mixture into small meatballs (about 1 cm in size).
Once the meatballs are formed, add them to the pot. Stir the pot to evenly distribute the meatballs.
Add additional spices to taste (pepper, oregano, paprika, dill, chili, and salt if needed).
Continue simmering the soup for an additional 10 minutes. If desired, taste the soup and add more spices if needed. Simmer for an extra 5 minutes.
Serve the soup hot, with a bit of sour cream or Greek yogurt on top if desired.