“Thank you for calling Wal-Mart, we’re out of the Patti LaBelle pie, how can I help you?” was the message a writer at the Washington Post received this weekend after calling the store, where the pies are sold for $3.48.

Ingredients: 4 ounces butter, softened 2 cups cooked and mashed sweet potatoes 2 cups granulated sugar 1 small can (5 ounces, about 1/2 cup plus…