Start by bringing a large pot of salted water to a boil. Add the egg noodles and cook according to package instructions until al dente. Drain and set aside.
In a large skillet, heat the olive oil over medium heat. Add the chopped onion and sauté for about 3-4 minutes until translucent. Add the minced garlic and cook for an additional minute, stirring frequently to avoid burning.
Add the ground turkey to the skillet, breaking it apart with a spoon. Cook for about 5-7 minutes until browned and cooked through. Season with salt and pepper to taste.
Mix in the sliced mushrooms and continue cooking for another 5 minutes, until the mushrooms are softened and have released their moisture.
Pour in the beef broth, Worcestershire sauce, and Dijon mustard. Stir well to combine, bringing the mixture to a simmer. Allow it to cook for about 5 minutes to let the flavors meld.
Remove the skillet from the heat and stir in the sour cream until fully incorporated. Adjust seasoning with more salt and pepper if needed.
Add the cooked egg noodles to the skillet and gently toss to combine until the noodles are well coated with the creamy sauce. Garnish with chopped parsley before serving.