Season the beef cubes with salt and pepper. Heat 1 tablespoon of oil in a large skillet over high heat. Add half the beef in a single layer and cook without stirring for 30 seconds. Flip and cook for another 30 seconds, then transfer to a plate, it’s okay if some pieces are pink. Repeat with the remaining beef, adding more oil if needed.
1 pound boneless rib eye steaks, 2 tablespoons vegetable oil, Salt and pepper
Lower the heat to medium-high and melt the butter in the same skillet. Add the sliced shallots and cook for about 1 minute, stirring occasionally. Add the mushrooms and sauté until golden and tender, about 4–5 minutes.
3 tablespoons butter, 3 shallots, 10 ounces mushrooms
Scrape up any browned bits from the skillet with a spatula. Sprinkle the flour over the mushrooms and shallots, stirring to coat evenly. Gradually pour in half the beef broth, stirring constantly to create a smooth sauce. Add the remaining broth and stir until fully combined.
2 tablespoons flour, 2 cups beef broth
Reduce the heat to medium-low and stir in the sour cream. Let the sauce simmer gently for 3–5 minutes, stirring occasionally, until it thickens to a creamy consistency. Season with Italian spices and adjust salt and pepper to taste.
⅔ cup sour cream, 1 teaspoon Italian spices blend
Return the seared beef and any juices to the skillet, stirring to coat in the sauce. Let it simmer for 1 minute to heat through, then remove from the heat. Serve over cooked egg noodles and garnish with fresh parsley or chives, if desired.
10 ounces egg noodles, Fresh herbs