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For the white wine sauce: Heat the wine in a medium skillet over medium heat. Cook until the wine is reduced by half, and then add the butter, parsley, tomatoes and lemon and cook until heated through. Taste and season with salt and pepper.
Mix together the breadcrumbs, spinach, cheese, butter, mayonnaise, Parmesan, parsley, chives, artichoke hearts, garlic, lemon and shallots. Stuff the mushrooms caps with the filling and bake until the filling is golden brown, 15 minutes.
Transfer to a serving plate and top with white wine sauce.