Preheat the oven to 400°F.
In a large bowl, combine ground turkey, breadcrumbs, egg, onion, garlic, paprika, nutmeg, salt, onion powder, and pepper. Mix until just combined.
Form the mixture into 1-inch meatballs and place on a greased baking sheet.
Bake the meatballs for 20 minutes, or until cooked through.
While the meatballs bake, melt butter in a skillet over medium heat. Stir in flour and cook for 2 minutes. Gradually whisk in beef broth and bring to a simmer. Add Worcestershire sauce, soy sauce, allspice, nutmeg, and thyme.
Simmer until thickened, about 10 minutes. Reduce heat and stir in sour cream. Do not boil.
To the sauce, add salt to taste and adjust the flavor with more Worcestershire if needed.
Add the baked meatballs to the sauce, stirring to coat. Cook for an additional 5 minutes. Serve hot with fresh parsley sprinkled on top.