If your baking marathon has left you with a shortage of cooling racks, place three or four canning jar rings on the countertop. The elevation of the rings allows for air to circulate below the cooling item.
An overturned splatter screen provides a perforated rack that’s the perfect size for cooling extra cookies.
Just because you’re using your oven doesn’t mean you’re using every oven rack. Remove an unused rack from the oven before it heats up, then set it over the sink, which allows for air circulation below the cooling (or drying) item. Like these? See more quick tips at Cook's Illustrated.