Would anyone know how many cups of frosting it takes for an 11x15 one layer cake? Much appreciated.

here's the wilton chart.

Jen

http://www.wilton.com/cakes/making-cakes/baking-wedding-cake-2-inch-pans.cfm

Thank you Jen.  I do have that chart. It's based on a two layer cake. I could cut down on the amount of frosting but was hoping someone might know the approx amount to use. Again, thank you for your response.

AHalf it—it would be half as much.