1 tablespoon olive oil, more as needed
1 1/4 kg whole pork loin
1 pinch salt and black pepper, to taste
1/4 teaspoon garlic powder, to taste
1 onion, chopped
230g fresh mushrooms, sliced
1/4 cup white wine
1 (400g) tin condensed cream of mushroom soup
2 tablespoons Dijon mustard
1/4 cup sour cream
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