01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - Combine ground turkey, breadcrumbs, egg, parsley, garlic, onion, thyme, salt, and pepper in a large bowl. Mix until just combined.
03 - Shape mixture into 20-24 small meatballs and place on prepared baking sheet.
04 - Bake for 15-18 minutes until lightly browned and cooked through. Set aside.
05 - Heat olive oil in a large skillet over medium heat. Add mushrooms and onions, sauté for 5-6 minutes until softened and golden.
06 - Add minced garlic and cook for 1 minute until fragrant.
07 - Sprinkle flour over vegetables and stir well, cooking for 1 minute to remove raw flour taste.
08 - Gradually whisk in chicken broth, scraping up browned bits. Add Worcestershire sauce and Dijon mustard. Simmer for 3-4 minutes until sauce thickens.
09 - Lower heat and stir in sour cream until smooth. Season with salt and pepper to taste.
10 - Add baked turkey meatballs to sauce and simmer for 5 minutes to heat through.
11 - Serve meatballs and sauce over cooked egg noodles. Garnish with fresh parsley.