By Brittany Miller

Copyright independent

National Cheeseburger Day is celebrated annually on September 18, though the exact origins of the cheeseburger remain a subject of debate.

Many fast-food restaurants across the United States are offering special deals, discounts, and freebies to mark the occasion.

McDonald’s is providing $0.50 Double Cheeseburgers via its app, while Burger King offers a free Bacon Cheeseburger to Royal Perks members with a $1 purchase.

Dairy Queen is giving away a free Double Original Cheeseburger Stackburger with a $1 purchase, and Applebee’s has an $8.99 meal deal for dine-in or app orders.

Other participating chains include Wendy’s, Sonic, White Castle, and Buffalo Wild Wings, with promotions ranging from discounted items to buy-one-get-one-free offers.