Cook the egg noodles according to package instructions until al dente. Drain and set aside.
In a large skillet, heat olive oil over medium heat. Add the chopped onion and sauté for 3-4 minutes until soft and translucent.
Add the minced garlic and sliced mushrooms to the skillet. Cook for an additional 5-7 minutes until the mushrooms are browned and their moisture has evaporated.
Stir in the vegetable broth, soy sauce, Dijon mustard, and smoked paprika. Allow the mixture to simmer for about 5 minutes, allowing the flavors to meld.
Lower the heat and slowly mix in the sour cream or plant-based yogurt. Stir until the sauce is creamy and well combined. Season with salt and pepper to taste.
Toss the cooked noodles into the sauce, ensuring they are well coated. If the mixture is too thick, add a splash of water or more vegetable broth to achieve your desired consistency.
Serve hot, garnished with freshly chopped parsley.
Notes
For a plant-based version, use plant-based yogurt.