US-based drive-in restaurant chain Sonic has expanded its menu with the launch of the Quarter Pound Double Stack Cheeseburger.

Featuring two beef burgers, cheddar cheese and cheese sauce, the new offering will be available for $2.99 for a limited time period.

Sonic’s product innovation and development vice-president Scott Uehlein said: “Sometimes a little something extra goes a long way, especially when it comes to a flavour profile that is extra savoury, juicy and melty.

“We took a classic cheeseburger and elevated what makes it great adding double the cheese in the middle, a second juicy patty and amped-up burger toppings to create a new Sonic experience that is truly irresistible.”

“We took a classic cheeseburger and added double the cheese in the middle, a second juicy patty and amped-up the burger toppings.”

Earlier this year, Sonic added the Breakfast Slinger burger to its menu, which featured either egg and cheese, crispy bacon or sausage. The egg and cheese variant is made using melted cheese, eggs and a buttery brioche bun.

In September, multi-brand restaurant company Inspire Brands signed a definitive merger agreement to purchase Sonic for approximately $2.3bn.

Under the agreement, the parent company of Arby’s and Buffalo Wild Wings will pay $43.50 per share in cash and assume Sonic’s net debt. Sonic’s board of directors have unanimously approved the agreement.

Sonic currently operates around 3,600 drive-in restaurants.