Great the Parmesan. Clean the mushrooms and remove the stems. Finely chop the stems and set aside.
Peel and crush the garlic, top with olive oil and salt and leave to infuse.
Add oil to a medium skillet over medium heat. Add the chopped mushroom stems and cook until all water has evaporated. Add the garlic and 2 tbsp of breadcrumbs and cook for 1-2 minutes. Turn the heat off, season with salt, pepper and nutmeg. Stir and let the mixture cool down slightly.
Add the cream cheese and grated parmesan to a large bowl and mix well. Stir in the thyme and nutmeg. Add the mushroom stem mixture and mix together. Fill the 3 Portobello Mushrooms with the cheese mushroom mixture. Sprinkle over with some breadcrumbs and Parmesan. To finish, use a pastry brush and apply melted butter on top.
Bake until golden and soft, approximate 20minutes at 190ºC.