KANSAS CITY — Mushrooms are growing on restaurant menus, and new menu item releases indicate that the flavorful fungus is a favorite on burgers.

Carl’s Jr.’s new burger showcases the in-demand ingredient: the Mushroom & Swiss All-Natural Burger. The burger features a charbroiled beef patty along with a slice of Swiss cheese, sautéed mushrooms, tomatoes, mayonnaise, lettuce and red onion all served on the chain’s signature Fresh Baked Bun.

 “Mushrooms truly are ‘natural beauties,’ providing important nutrients, including B vitamins, vitamin D, selenium, potassium, riboflavin, niacin and more,” said Bart Minor, president and chief executive officer for the Mushroom Council. “Our own research has found that millennials, as well as Gen Z and Gen Y customers, love mushrooms because of their natural, meaty flavor and are looking for menu items that incorporate better-for-you ingredients that taste great - especially in (food service). Mushrooms are the perfect pairing and the ‘natural’ choice for this all-natural burger.”

Button mushrooms blossom on Buffalo Wild Wing’s new Boston Lager Burger. Served on a brioche bun, the burger offers red onions, button mushrooms braised with Samuel Adams Boston Lager, Swiss cheese, and garlic mustard sauce atop a burger.

Portobello mushrooms are the prominent piquancy on Jack in the Box’s new Portobello Mushroom Buttery Jack. The burger features a quarter pound beef patty, melted garlic herb butter, Swiss cheese, Portobello mushrooms, peppercorn mayonnaise, and grilled onions served on the chain’s signature bun.

Click for a slideshow of more new menu items.