Preheat a skillet over medium heat and add olive oil.
Mince the garlic and sauté it until fragrant, about 30 seconds.
In a bowl, combine the ground turkey with salt, pepper, and dried oregano. Form the mixture into small meatballs.
Brown the turkey meatballs in the skillet for 3-4 minutes on each side until lightly browned. They do not need to be fully cooked through as they will finish cooking in the soup.
Dice the carrot, celery, and onion into small pieces.
In a large pot, add the low-sodium chicken broth and bring it to a simmer.
Add the diced vegetables, cooked lentils, and diced tomatoes to the pot. Stir to combine.
Gently place the turkey meatballs into the simmering soup. Allow the soup to simmer for 15-20 minutes, or until the meatballs are cooked through and the vegetables are tender.
Taste the soup and adjust seasonings with salt and pepper as needed.
Serve the soup hot, enjoying the comforting mix of savory turkey meatballs and nutrient-rich vegetables.