The slivered onions supplier used dirty equipment that led to cross-contamination, the FDA said, and employees failed to meet other sanitation standards, including proper hand washing.

Federal inspectors uncovered numerous food safety issues at Taylor Farms' Colorado facility, including equipment found with "large amounts of food debris."

According to the FDA, food debris was found on equipment supposedly fully cleaned at the Taylor Farms food production facility in Colorado that supplied slivered onions used at McDonald's. Investigators also discovered workers were only using proper hand sanitization processes sometimes.

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FDA inspectors reported that employees who worked with food did not wash their hands or maintain hygiene, stated CBS News.

U.S. Food and Drug Administration (FDA) officials have uncovered dozens of violations at a McDonald's supplier tied to last year's deadly E.coli outbreak, which sickened over 100 people and led to a massive recall of onions used in the fast-food giant's signature Quarter Pounder burgers.