Discard dark or soft spots from mushrooms. Quickly swish mushrooms in cool water to rinse, then drain. Cut into 1/2- to 3/4-inch-thick slices. Melt butter in a 10- by 15-inch rimmed pan. Turn mushrooms over in butter; arrange side by side. Bake in a 400° oven about 10 minutes. Turn slices over; bake until browned, 10 to 15 minutes more. If making ahead, let cool in pan, then reheat in oven 4 to 5 minutes. Season with salt and pepper.
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* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.