Start by slicing the pork into thin strips. Chop the onion finely. Slice the mushrooms evenly. Keep everything ready before cooking. This makes the process smooth and quick. Good preparation saves time and helps you cook without stress.

Place a large frying pan on medium heat. Add olive oil and butter together. Let the butter melt slowly. This creates a rich base for cooking. Make sure the pan is hot but not smoking before adding ingredients.

Add the sliced pork to the pan. Cook for 4–5 minutes until lightly browned. Stir gently while cooking. Do not overcrowd the pan. Remove the pork and set it aside once cooked.

In the same pan, add chopped onion. Cook for 3–4 minutes until soft. Add garlic and cook for one more minute. The smell will become rich and tasty. This step builds the flavor base.

Add sliced mushrooms to the pan. Cook them slowly until soft and slightly golden. This takes around 5–7 minutes. Mushrooms release water first, then become flavorful. Stir occasionally for even cooking.

Sprinkle paprika over the mixture. Add Dijon mustard and mix well. These ingredients bring warmth and depth. Cook for one minute so the spices blend nicely with the vegetables.

Add chicken stock slowly. Stir well to combine everything. Let it simmer for 5 minutes. The sauce will start to thicken slightly. This step adds richness to the dish.

Put the cooked pork back into the pan. Mix gently with the sauce. Let it cook for another 5 minutes. The pork absorbs all the flavors and becomes very tender.

Lower the heat before adding sour cream. Stir gently until smooth and creamy. Do not boil after this step. This keeps the sauce silky and prevents curdling.

Sprinkle fresh parsley on top. Serve hot with rice, pasta, or mashed potatoes. The creamy texture and rich flavor make it perfect for any meal.