avocado oil (or other high–heat friendly oil)
freshly cracked black pepper
Heat oven to 375°F.
On a rimmed sheet pan, toss the mushrooms with oil (they’ll absorb it). Sprinkle over the mushrooms: the salt, black pepper, and Cayenne pepper. Toss until evenly coated. Spread out so they’re not touching one another; otherwise, they’ll steam.
Bake for about 35 to 40 minutes in total, flipping once midway through, until they’re crispy and browned with just the slightest spot of chewiness remaining in the center.