On a parchment lined baking sheet, place the mushrooms caps, gill side up. Spray with olive oil and sprinkle with salt and freshly cracked black pepper. Roast for 10 minutes. Meanwhile, mix the breadcrumbs with the olive oil and spices. After 10 minutes remove the mushroom caps from the oven. Drain the juices that have pooled in the center of the mushroom into a container and save— this makes amazing mushroom broth! If you have no need for the broth, keep it in the mushroom. Top 4 of the 8 mushroom caps with the breadcrumbs and return to the oven to bake for another 7-10 minutes, until breadcrumbs are golden.