Combine sugar and corn syrup in a medium saucepan over medium heat. Cook, stirring occasionally, until the sugar dissolves. Immediately remove from heat; add peanut butter, stirring to combine.
Pour peanut butter mixture over corn flakes, and toss gently to combine, being careful not the crush the corn flakes.
Quickly drop by heaping tablespoonfuls onto a large baking sheet lined with parchment or wax paper. Allow cookies to stand at room temperature at least 30 minutes or until set. Store in an airtight container.
Recipe by The eMeals Blog at http://blog.emeals.com/no-bake-peanut-butter-corn-flake-cookies/