Creamy Mushroom Soup

Ingredients

• 2 tbsp olive oil (plus extra to serve)
• 2 tbsp unsalted butter
• 1 medium brown onion, chopped
• ½ tsp sea salt
• Black pepper, to taste
• 400g white button mushrooms, sliced
• 200g Swiss brown (cremini) mushrooms, sliced
• 2 garlic cloves, finely grated or crushed
• ¼ cup dry white wine
• 3 cups vegetable stock
• 1 tbsp salt-reduced soy sauce or tamari
• 1 tbsp fresh thyme leaves (or 1 tsp dried)
• ½ cup thickened cream or crème fraîche (optional)
• Fresh parsley, chopped, to serve