Stop Child Hunger Act of 2021 This bill establishes a permanent program and provides funds for electronic benefit transfer (EBT) cards to cover meals for children during extended school closures. Specifically, the Department of Agriculture must establish a program to provide EBT cards to cover meals for children who are enrolled in the National School Lunch Program or School Breakfast Program when a school is closed, operating remotely, or a combination of both for a period of five days or more. Cards may be used to purchase food from approved retailers under the Supplemental Nutrition Assistance Program.