Are you celebrating HalloWEENDY's?

Halloween treats aren't just for kids this spooky season, as Wendy's offers festive fun for the whole family – adults too.

Starting Monday, October 21st, while supplies last, fans can purchase a limited edition Boo! order. Bag meal with a Dave's Single Burger, a small Hot & Crispy Fry, a small Frosty, a glow-in-the-dark Bone Chiller Frosty figure and a Boo! Book voucher sampler.

The Boo! The books come with coupons for five free Junior Frosty treats and a bonus $1.99 kids meal coupon with any purchase, valid through the end of the year.

Buying a Boo! Bag is not just a joy for itself. Every boo! Book voucher book sold until November 3rd – whether in the Boo! Bag or individually for just $1 – supports adoption of children into foster care through the Dave Thomas Foundation for Adoption.

Coupon books can be purchased separately through the mobile app or at Wendy's self-order kiosks – just add them in the “Give Back” section.

Buuuuh! Bags are on the menu alongside Wendy's Frosty Frights kids meal, which offers a choice of four-piece chicken nuggets or a hamburger or cheeseburger with Junior Hot & Crispy Fries or Apple Bites and a kid's drink.

With the introduction of Boo! Bags, everyone in the family can get a Halloween treat at Wendy's.

The fries were recently named the second best fast food french fries by critics.

Wendy's isn't the only chain offering a Halloween deal.

McDonald's – which took the top spot in the fries rankings – recently announced that its popular Happy Meal Book Buckets are back and will feature new colors and custom stickers.