Preheat the oven to 475 degrees F with a rack set about 4 inches from the heat source. Put a baking sheet on the rack to heat up while you prep the mushrooms.
Use a knife to cut off just enough of the base to separate the mushrooms-you may need to use your hand to help separate them. Discard the bases and put the mushrooms into a large mixing bowl. Drizzle the olive oil over the mushrooms and season with 1/4 teaspoon pepper. Toss to coat.
Remove the hot baking sheet from the oven and pour the mushrooms onto the sheet. Use a spatula to gently spread out the mushrooms into a single layer. Roast until mostly golden brown and crispy, about 20 minutes, using a spatula to turn the mushrooms occasionally so that they cook evenly.
Season the mushrooms liberally with salt and pile in a small bowl. Serve immediately as a bar snack-or any snack.
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