Boil a pot of water and cook the egg noodles according to package directions; drain and set aside.
Heat the extra virgin olive oil in a large skillet over medium-high heat.
Season the beef sirloin strips with half of the sea salt and black pepper, then sear in the skillet until browned, about 2-3 minutes per side.
Remove the beef from the pan and set it aside on a plate.
In the same skillet, add the diced yellow onion and sliced cremini mushrooms, sautéing until the mushrooms release their moisture and turn golden brown.
Stir in the minced garlic and cook for 30 seconds until fragrant.
Pour in the beef broth to deglaze the pan, using a wooden spoon to scrape up any browned bits from the bottom.
Reduce the heat to low and stir in the plain Greek yogurt until a smooth, creamy sauce forms.
Return the beef to the skillet, season with the remaining salt and pepper, and toss to coat thoroughly in the sauce.
Serve the beef and mushroom mixture over the cooked egg noodles and garnish with chopped fresh parsley.