Step 1: Cook the Beef and Onions

Heat olive oil in a large skillet over medium-high heat. Add the ground beef and cook until browned, breaking it up with a wooden spoon. Drain excess fat if necessary. Add the chopped onion and cook until softened, about 3–4 minutes.

Step 2: Add Mushrooms and Seasonings

Stir in the sliced mushrooms and cook until they release their moisture and become golden. Season with salt, pepper, and minced garlic. Cook for another 1–2 minutes until fragrant.

Step 3: Make the Creamy Sauce

Push the beef mixture to one side of the pan. Add butter and flour to the empty space, whisking to make a quick roux. Slowly pour in the beef broth while stirring, scraping up any browned bits. Let it simmer for 5 minutes until slightly thickened.

Step 4: Combine with Noodles

Meanwhile, cook the egg noodles according to package instructions. Drain and set aside. Stir sour cream into the beef mixture to make a silky sauce, then fold in the noodles until well coated.

Step 5: Serve Warm and Enjoy

Garnish with fresh parsley and serve hot. This dish pairs perfectly with a crispy green salad or steamed vegetables.