Rebekah Speights of Dakota City said she received the item from a Sioux City McDonald's three years ago and had kept it frozen until Sunday, when a sermon at the Family Worship Center inspired her to sell the item on eBay to benefit the church, the Sioux City (Iowa) Journal reported Thursday.
The Washington McNugget was listed on eBay Monday and soon received its first bid of $100.
"We just screamed," Speights said. "We don't know who it is or where they're from. That bid came within the first hour."
The McNugget had a high bid of $321 Thursday with six days of bidding remaining.
Speights said the church is trying to raise $15,000 to sent 50 children to a Dayton, Iowa, summer camp.