Season the beef strips lightly with salt and black pepper.
Heat olive oil in a large skillet over medium-high heat. Sear beef in batches until browned, approximately 2 minutes per side. Remove beef from skillet and set aside.
In the same skillet, add the onion and mushrooms. Sauté until the onions are translucent and the mushrooms have released their moisture and browned, about 7 to 8 minutes.
Add the garlic, tomato paste, and smoked paprika. Cook for 60 seconds until fragrant.
Pour in the beef broth and Worcestershire sauce, scraping the bottom of the pan to deglaze. Bring the mixture to a gentle simmer.
In a small bowl, whisk together cornstarch and water to create a slurry. Stir the slurry into the skillet and simmer for 2 to 3 minutes until the sauce thickens.
Reduce heat to low. Return the seared beef and any accumulated juices to the skillet.
Remove the skillet from the heat source. Stir in the Greek yogurt until fully incorporated and the sauce is creamy. Do not boil after adding yogurt to prevent curdling.
Serve the beef and sauce over the cooked whole wheat egg noodles and garnish with chopped parsley.