Preheat oven to 425 degrees F. Ready a half sheet pan (use full sheet if making multiple batches).

Clean the mushrooms then slice in half. Toss with olive oil, salt, pepper, and any other seasonings you might want for this batch. Spread out the mushrooms, cut side down, and roast for 10 minutes. Flip and roast 10-15 more minutes, until tender, dryish, and a wondrous golden brown on the cut side.

Calories: About 40 per one-half recipe. Could be great for meal prep if done in a larger bulk.