In a large bowl, combine turkey, garlic and herb seasoning, egg white and 1/2 teaspoon each salt and black pepper. Mix well and shape mixture into about 32 meatballs. Place meatballs in bottom of slow cooker.
In a medium bowl, whisk together tomato sauce, broth, chili sauce, vinegar, brown sugar, and thyme. Pour mixture over meatballs.
Cover and cook on LOW for 6 to 8 hours or on HIGH for 3 to 4 hours. Season, to taste, with salt and black pepper. Serve half of the Meatballs with Mashed Red Potatoes and Steamed Broccoli. Refrigerate the other half for Turkey-Stuffed Zucchini Boats later in the week.
Mashed Red Potatoes:
Place potatoes and garlic cloves in a large saucepan and pour over enough water to cover. Set pan over high heat and bring to a boil. Boil 8 minutes until potatoes are fork-tender. Drain and return potatoes and garlic cloves to pan. Mash in sour cream until desired consistency. Fold in chives. Season, to taste, with salt and pepper.