Gently pound the beef sirloin slices to tenderize them. Season both sides with salt and pepper.
In a large skillet, heat the olive oil and half of the butter over medium heat. Cook the steak slices for 2-3 minutes per side, until a golden-brown crust forms. Set the cooked steaks aside and keep warm.
In the same skillet, sauté the finely chopped onion and garlic until fragrant.
Add the sliced mushrooms and cook for 4-5 minutes, until softened and lightly browned.
Pour in the brandy and deglaze the pan, scraping up any browned bits from the bottom. (Caution: be careful with the flaming alcohol!)
Add the Worcestershire sauce and heavy cream. Stir well to combine, and cook until the sauce slightly thickens.
Return the steak slices to the skillet and spoon the sauce over them. Cook for 1-2 minutes, allowing the meat to absorb the flavors of the sauce.
When serving, sprinkle with freshly chopped parsley and serve with mashed potatoes or steamed vegetables.
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