Prepare as directed. Store shredded meat mixture and onions in an airtight container in the freezer for up to 1 month. To serve, thaw overnight in the refrigerator. Transfer to a medium saucepan. Cook over low heat until heated through, stirring occasionally.
For easy cleanup, line your slow cooker with a disposable slow cooker liner. Add ingredients as directed in recipe. Once your dish is finished cooking, spoon the food out of your slow cooker and simply dispose of the liner. Do not lift or transport the disposable liner with food inside.