Wipe the mushrooms clean with a damp paper towel
Remove the stems if desired
Scrape out the gills if desired
Slice, quarter, or leave whole
Season with oil, salt, pepper, and optional garlic or herbs
Grill over medium-high heat for 4 to 5 minutes per side
Roast at 400°F for 15 to 20 minutes
Sauté in a skillet over medium heat for 5 to 7 minutes per side
Bake stuffed portobellos at 375°F until tender and filling is heated through
Broil for 3 to 5 minutes per side, watching closely
Serve immediately