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Trim off tough stem ends and wipe dirt off mushrooms with a damp paper towel. (Some varieties will need a quick rinsing under a spray of cold water, but dry thoroughly.) Slice caps and remaining stems and set aside. Heat olive oil and butter together in large skillet over medium/high heat. Add shallots and cook for 2 minutes, stirring around. Add smashed garlic cloves and continue to sauté until they just start to color. Add mushrooms and sprinkle with salt and pepper. Cook about 6 minutes, stirring and shaking pan frequently (during this time the mushrooms will release their liquids and then reabsorb them.) Add sherry, increase heat slightly, and let evaporate about a minute. Reduce heat to low, sprinkle with parsley and serve immediately, either as is as a side dish, or over toasted bruschetta, rubbed with raw garlic. Variation: For a more complex dish with different textures, try sautéing diced prosciutto with the shallots and adding baby peas or asparagus pieces to the pan the same time as the mushrooms.