Remove the stems from the mushrooms and wipe any dirt off with a paper towel.
Brush mushrooms with oilive oil. Set aside.
Finely chop the mushrooms stems and fry in a large pan with the remaining oil and cook for 2-3 minutes. Add the garlic puree, stir and cook for another couple of minutes.
Add the spinach to the pan and stir until wilted.
Remove from the heat, stir in the extra light sour cream and then cools lightly.
Preheat your grill or oven.
Spoon the spinach mixture into the centre of the mushrooms, sprinkle with freshly grated parmesan and place them in the preheated oven. Cook for 10-12 minutes. You may like to grill a further 1-2 minutes for prfectly grilled cheese on top. The mushrooms will be done when they are juicy, firm but tender and a glossy, dark brown colour.
Rest the mushrooms for a couple of minutes, then enjoy them warm, with crusty sourdough bread & a fresh garden salad!