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PEEL the onion, then slice into small chunks. CLEAN the mushrooms using a mushroom brush or paper kitchen towel. THINLY slice each mushroom.
MELT butter in a medium-sized pan and sauté the onion for a few minutes. ADD sliced mushrooms, cook for 5 minutes. You'll notice moisture starts to separate from the mushrooms, this will give the mushroom cream sauce its flavour.
ADD flour and cook for a few minutes. The combination of the flour and butter is also known as a roux. A roux acts as a thickening agent. POUR beef stock into the pan and bring to a boil.
ADD the heavy cream and keep stirring until a smooth sauce appears. SEASON with salt and pepper.
You can serve the mushroom cream sauce with various meats such as a beef schnitzel. Enjoy your meal!