he Best Sautéed Mushrooms Recipe starts out just like any other sautéed mushrooms recipe, with a bit of butter and garlic. However, the key is to not dump everything in at once.Start by searing the mushrooms in butter and oil, so that they release their juices and caramelize to a rich golden-brown hue around the edges.Add the garlic half-way through the caramelization process, so it doesn’t burn. nce the mushrooms are well caramelized, add fresh thyme leaves and dry sherry.Simmer the mushrooms over low heat until they absorb all the sherry. Lower the heat and be patient.