Preheat the broiler. In a large skillet, melt the butter over medium heat. Add the shallots and saute, stirring occasionally, until softened, 3 to 5 minutes. Add the mushrooms, wine and salt/pepper mix and cook until all the liquid evaporates. Add cream and reduce to a sauce consistency. Taste for seasoning. Transfer mixture to an ovenproof dish and top with the Asiago cheese. Place under the broiler until the cheese melts.