Carl's Jr. and Hardee's are taking the Instagram virality of fried cheese patties and making it a ubiquitous fast food item.

Photo courtesy of Carl's Jr.

The Carl's and Hardee's version of the food fad is known as the Big Fried Cheese (BFC), and consists of a blend of cheddar and mozzarella cheeses coated in a seasoned breading.

Both restaurants will be getting signature sandwiches that contain the fried cheese on the menu. Carl's and Hardee's will both have a BFC Angus Thickburger featuring the cheese and a 1/3 pound patty, while Hardee's will also have a BFC Frisco Breakfast sandwich that adds egg, sliced cheese, and bacon to the gooey concoction.

Photo courtesy of Carl's Jr.

These aren't the only offerings the BFC can be added to, however. Any burger or breakfast sandwich that either fast food chain offers up can also get a fried cheese patty upgrade. At a $3 upcharge, everything from Beyond Famous Stars to Grilled Cheese Breakfast Sandwiches can get the molten, fried cheese disc added on.

All Carl's Jr. and Hardee's locations nationwide now have the Big Fried Cheese on the menu, which appears to be a permanent menu option.