Begin by cooking the egg noodles according to package instructions. Once done, drain and set aside.
In a large skillet, heat 2 tablespoons of olive oil over medium-high heat.
Add the sliced chicken and cook for about 5-6 minutes or until browned. Season with salt and pepper.
Remove the chicken from the skillet and set it aside. In the same skillet, add the onions and sauté until they become translucent, about 3-4 minutes.
Add the minced garlic and sliced mushrooms to the onions and cook until the mushrooms are tender, approximately 4-5 minutes.
Sprinkle 1 tablespoon of flour over the mushroom mixture and stir to combine. Cook for an additional minute to cook the flour slightly.
Slowly pour in the chicken broth while constantly stirring to avoid lumps. Cook until the mixture thickens, about 2-3 minutes.
Lower the heat and stir in the sour cream and Dijon mustard. Mix well to create a creamy sauce.
Return the chicken to the skillet and simmer for an additional 3-4 minutes, allowing the flavors to meld. Adjust seasoning with salt and pepper to taste.
Serve the creamy chicken stroganoff over the cooked egg noodles, garnish with freshly chopped parsley.