In a large saucepan, combine the sugar, corn syrup, and peanut butter. Cook over medium high heat until center starts to boil, make sure to stir constantly so the sugar doesn't burn.

As soon as the sugar mixture comes to a boil, remove from heat and stir in the vanilla extract and corn flakes, mix until corn flakes are evenly coated in sugar mixture.

Use an ice cream scoop to drop cookies onto parchment or wax paper as quickly as possible before mixture starts to cool and harden.

Let cool on wax paper for 20 to 30 minutes before enjoying.