Heat 1 tablespoon oil in a large skillet over medium-high heat (if you only have a small skillet cook beef in 2 batches versus 1). Add beef and sear for 3-5 minutes per side for medium-rare.
Meanwhile, cook egg noodles as per package instructions. Drain and set aside.
In another pan, heat remaining 2 tbsp of oil over medium heat and add mushrooms and onions. Cook, stirring rarely for approximately 7 minutes. Mix in Greek yogurt, reduce heat, and simmer for about 5 minutes.
Add noodles to yogurt mixture and stir until well combined. Transfer to a serving dish, top with beef* and sprinkle with chopped dill.
