McDonald's is being bombarded with photos of mozzarella sticks missing a key ingredient

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McDonald's Mozzarella Sticks Are Now Available Nationwide

McDonald's is under fire from customers accusing the burger chain of serving mozzarella sticks that are missing a key ingredient: cheese.

Customers are posting pictures of hollowed-out mozzarella sticks online and accusing the burger chain of serving them "fried air."

McDonald's launched mozzarella sticks nationwide this month as part of a new "McPick 2" promotion, which allows customers to pick two of the following for $2: a McDouble, a McChicken, small fries, and mozzarella sticks.

The mozzarella sticks are also available on their own, costing $1 for three sticks.

RELATED: Take a peek at these McDonald's couture dresses

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McDonald's is being bombarded with photos of mozzarella sticks missing a key ingredient
MIAMI BEACH, FL - NOVEMBER 5: Here comes the bride, in McDCouture. The design by, Ricardo Hardouin, a Miami International University of Art and Design Fashion Student was created with 900 white sandwich wrappers, 60 yellow sandwich wrappers and 20 fry boxes for the McDCouture Fashion Show at Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: Here comes the bride, in McDCouture. The design by, Ricardo Hardouin, a Miami International University of Art and Design Fashion Student was created with 900 white sandwich wrappers, 60 yellow sandwich wrappers and 20 fry boxes for the McDCouture Fashion Show at Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs left the audience hungry for more McDCouture at Funkshion Fashion Week Miami Beach. One of 20 one-of-a-kind designs created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs left the audience hungry for more McDCouture at Funkshion Fashion Week Miami Beach. One of 20 one-of-a-kind designs created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs served up McDCouture at Funkshion Fashion Week Miami Beach. One of 20 looks created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs left the audience hungry for more McDCouture at Funkshion Fashion Week Miami Beach. One of 20 one-of-a-kind designs created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs left the audience hungry for more McDCouture at Funkshion Fashion Week Miami Beach. One of 20 one-of-a-kind designs created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs served up McDCouture at Funkshion Fashion Week Miami Beach. One of 20 looks created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs served up McDCouture at Funkshion Fashion Week Miami Beach. One of 20 looks created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDCouture Fashion show opened with fashion student Sebastian Cubidesà one-of-a-kind design created from 50 to go bags, seven Quarter Pounder with Cheese boxes, seven Chicken McNugget boxes, 20 fry boxes. His was one of 20 looks created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs left the audience hungry for more McDCouture at Funkshion Fashion Week Miami Beach. One of 20 one-of-a-kind designs created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs left the audience hungry for more McDCouture at Funkshion Fashion Week Miami Beach. One of 20 one-of-a-kind designs created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs left the audience hungry for more McDCouture at Funkshion Fashion Week Miami Beach. One of 20 one-of-a-kind designs created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs left the audience hungry for more McDCouture at Funkshion Fashion Week Miami Beach. One of 20 one-of-a-kind designs created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs left the audience hungry for more McDCouture at Funkshion Fashion Week Miami Beach. One of 20 one-of-a-kind designs created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: Keeping with McDonaldÃs gold standard, Kami LinÃs McDCouture evening gown, made from 30 fry boxes, 400 McChicken Sandwich wrappers and 500 Ãcreated for youà wrappers left the audience wanting more at the McDCouture Fashion Show during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: Designed for any time of the day by Miami international University of Art and Design Fashion student Stephanie Castanon, this all day breakfast McDCouture was created with 20 McCafe Cups, 30 hash browns, 150 Egg McMuffin wrappers, 200 Burrito wrappers, 20 all day breakfast coupons and one breakfast menu clock during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs served up McDCouture at Funkshion Fashion Week Miami Beach. One of 20 looks created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs served up McDCouture at Funkshion Fashion Week Miami Beach. One of 20 looks created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs served up McDCouture at Funkshion Fashion Week Miami Beach. One of 20 looks created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDCouture Fashion show opened with fashion student Sebastian Cubidesà one-of-a-kind design created from 50 to go bags, seven Quarter Pounder with Cheese boxes, seven Chicken McNugget boxes, 20 fry boxes. His was one of 20 looks created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs served up McDCouture at Funkshion Fashion Week Miami Beach. One of 20 looks created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs served up McDCouture at Funkshion Fashion Week Miami Beach. One of 20 looks created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
MIAMI BEACH, FL - NOVEMBER 5: McDonaldÃs served up McDCouture at Funkshion Fashion Week Miami Beach. One of 20 looks created from McDonaldÃs packaging and paper goods by Miami International University of Art fashion students during Funkshion Fashion Week Miami Beach at The Setai Hotel on November 5, 2015 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images for McDonald's)
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But photos posted online seem to show that for many customers, all three of the mozzarella sticks in their orders were missing a cheese filling.

When we tried some mozzarella sticks in November, all three sticks in our order contained cheese.

McDonald's did not immediately respond for comment.

Here's what people are saying on Twitter:

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