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kale (Photo : Facebook)

McDonald's is adding an ingredient that it guaranteed earlier this year it would never include on its burgers: kale. Along with ingredients such as spinach, the leafy vegetable will get tested in McDonald's breakfast bowls  at some Southern California restaurants.

Besides kale and spinach, one particular breakfast bowl will also include turkey sausage and egg whites. Such new dishes appeal to health-conscious consumers.

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The breakfast bowls will all cost around $4, and will be available at nine restaurants located in Southern California, according to New York Times.  The breakfast bowls are part of the company's turnaround plan due to McDonald's sales decline.

In other McDonald's kale news, a Canadian financial services firm stated in a client letter that McDonald's in Canada will add new kale menu items. The green leafy vegetable will be featured in three kale salads.

Kale has become popular in both U.S. supermarkets and restaurants during the past five years, according to Reuters. That is due to its being a "superfood" full of nutrients.  

Kale is closely related to wild cabbage, and  can have either green or purple leaves. Cooked kale  provides nearly 780 percent of the Daily Value (DV) for  Vitamin K.

McDonald's also announced on Wednesday that it will revive its Hamburglar character.  The burger robber has been on vacation from TV commercials since 2002.   

Hamburglar returns to Golden Arches TV ads as a suburban father. He will star in commercials advertising a one-third-pound McDonald's sirloin burger sold for a limited time.  

The iconic character's reboot is a sign that McDonald's is planning wholesale changes. In Quarter 1 of 2015, the global sales for restaurants open at least one year slid 2.3 percent.   

Ironically, three months ago McDonald's kale commercial bragged that its beef burgers were juicier than "soy." The ad then promised that  one of its hamburger toppings will never "be kale."