McDonald's sweet potato fries being sold here

Well known for its signature fries, McDonald's is testing out a new spin on them, made with sweet potatoes.

Some 18 restaurants in the Amarillo, Texas, area are selling the new fries.

McDonald's sweet potato fries.
Source: McDonald's

Prices vary by restaurant. On average, they are selling for $2.49 for a 16-ounce size.

"Considering the fries are a test, they will be offered for a limited time as we gather feedback from our customers," said McDonald's spokeswoman Jeanette DeBartolo. "There is currently no plan to launch them nationally."