"Subsequent analysis revealed the source of the peanut residue to be (Grain Craft's) soft red winter wheat flour," according to the FDA.
Multiple other samples from the flour company tested positive for peanut residue. The company stopped manufacturing and distributing the flour on April 30.
"The Hostess Brands products subject to the recall were produced using Grain Craft Flour that has now been recalled and, as a result, these products may contain low levels of undeclared peanut residue," Hostess Brands said in a statement.
Other products that have fallen under the recall include Cinnabon Stix and Chick-fil-A chocolate chunk cookies.