Sear the Beef: In a large skillet over medium-high heat, add olive oil. Once hot, add the sliced beef, season with salt and pepper, and sear for about 2-3 minutes until browned but not fully cooked. Remove the beef from the skillet and set aside.
Sauté Vegetables: In the same skillet, add the chopped onion and cook for about 2 minutes until translucent. Add the minced garlic and sliced mushrooms, cooking until the mushrooms are softened and most of their liquid has evaporated, about 5-7 minutes.
Add Flavors: Stir in the dried thyme, paprika, and any remaining salt and pepper. Cook for an additional minute to release the flavors.
Make the Sauce: Pour in the beef broth, Worcestershire sauce, and Dijon mustard. Stir to combine and bring the mixture to a gentle simmer.
Combine Everything: Add the egg noodles to the skillet and stir well to ensure they're coated with the broth mixture. Allow it to cook, uncovered, for about 7-10 minutes, stirring occasionally, until the noodles are al dente and most of the liquid is absorbed.
Finish with Cream: Once the noodles are cooked, lower the heat and stir in the sour cream, mixing everything together until it's creamy and well combined. Add the seared beef back into the skillet and cook for another 2-3 minutes, just until the beef is cooked through.
Serve: Taste and adjust seasoning if needed. Garnish with fresh chopped parsley before serving. Enjoy the cozy flavors of your One-Pan Beef Stroganoff.