Preheat the oven to 200℃. Remove the stems from the mushrooms and scrape the slats with a teaspoon. Place them on a baking tray, drizzle with olive oil and roast them in the oven for a few minutes or fry them in a frying pan.
Let the mushrooms cool upside down and blot out the moisture. Peel and finely chop the garlic. Sauté the garlic in some oil and stir-fry the spinach in it. Drain the spinach and fry the Garden Gourmet Filet Pieces for 4 to 5 minutes.
Boil the cranberries with honey and a little water until soft.
Place the mushrooms on a baking tray and fill with spinach, Filet Pieces and the grated cheese.
Bake them in the oven for a few more minutes and garnish with coarsely chopped walnut, lemon zest, cranberries and thyme.