There is a food spray...maybe Beth or Steve can tell you the name of it. However one thing you might consider is using an insert inside the pan, maybe an upside down plastic container, etc...this would cut the amount of loss. Another thing you can do is to cover with Saran wrap, its very transparent and from any distance with a tight fit is almost impossible to see.
HB
"This business isn't about what the customer sees...It's about what the customer believes!"