01 - Preheat the oven to 400°F and line a baking sheet with parchment paper.
02 - In a large bowl, mix ground turkey, breadcrumbs, egg, garlic, parsley, grated onion, salt, pepper, and smoked paprika until just combined.
03 - Shape the mixture into 20 to 24 small meatballs and arrange them on the prepared baking sheet.
04 - Bake the meatballs for 15 to 18 minutes until golden and fully cooked.
05 - While the meatballs bake, heat olive oil in a large skillet over medium heat. Add sliced mushrooms and cook until browned, approximately 5 minutes.
06 - Add finely chopped onion to the skillet and cook until softened, about 3 to 4 minutes. Stir in garlic and cook for an additional minute.
07 - Sprinkle flour over the vegetables and stir continuously for 1 minute. Gradually whisk in chicken broth, scraping any browned bits from the skillet.
08 - Stir in Worcestershire sauce and Dijon mustard. Allow the mixture to simmer gently for 3 to 4 minutes until the sauce thickens slightly.
09 - Reduce heat to low, then whisk in sour cream until the sauce is smooth. Adjust seasoning with salt and pepper to taste.
10 - Add the baked meatballs to the sauce and simmer gently for 5 minutes to heat through.
11 - Serve the meatballs and sauce over cooked egg noodles. Garnish with fresh dill or parsley as desired.