The Girl Scouts are celebrating a century of cookie sales by introducing new flavors.

FOX's Kathleen Maloney reports:

Two varieties of S'mores will bring the Girl Scout Cookie lineup to 12 in 2017. Both include the popular campfire combination of graham cracker, marshmallow and chocolate.

But one will be coated in chocolate. The other has the cracker on the outside. They'll be competing with classic favorites like thin mints and Samoas.

Girl Scouts started selling cookies back in 1917 when the Mistletoe Troop in Muskogee, Oklahoma, baked them in their high school cafeteria. Now they're made by commercial bakers and it's serious business.

The Girl Scouts make plenty of dough from cookie sales, about $800 million a year.

Kathleen Maloney, FOX News.