Step 1: Prepare the Noodles

• Preheat your oven to 350°F (175°C).
• Cook the egg noodles according to the package instructions. Drain and set aside.

Step 2: Cook the Beef

• Heat olive oil in a large skillet over medium-high heat.
• Add the sliced beef and cook until browned. Remove from skillet and set aside.

Step 3: Make the Sauce

• In the same skillet, melt the butter and sauté the onions and garlic until translucent.
• Add the mushrooms and cook until tender, about 5 minutes.
• Sprinkle the flour over the vegetables, stirring to combine. Cook for 1 minute.
• Gradually pour in the beef broth, stirring constantly until thickened.
• Reduce heat to low and mix in the heavy cream, sour cream, and half of the Parmesan cheese. Season with salt and pepper.
• Return the beef to the skillet, stirring until well combined.

Step 4: Assemble and Bake

• In a large mixing bowl, combine the cooked noodles with the beef and sauce mixture.
• Transfer to a greased 9×13-inch baking dish.
• Sprinkle the remaining Parmesan and mozzarella cheese over the top.
• Bake for 25-30 minutes, until golden brown and bubbly.

Step 5: Serve

• Garnish with freshly chopped parsley before serving.