General Mills Inc. GIS, -0.45% said late Monday it is recalling one of its Betty Crocker brand cake mixes from Canadian markets because of a possible E. coli contamination risk. The company said it is recalling boxes of its "Betty Crocker Super Moist brand Cake Mix Rainbow Bit" sold in Canada because of a possible contamination to the E. coli O121 bacteria. General Mills said no illnesses have been reported and that the Canadian Food Inspection Agency is conducting an investigation, which may lead to the recall of other products. General Mills shares were unchanged at $71.81 after hours.