Line two baking sheets with parchment. Pour corn flakes into a large mixing bowl.
Combine sugar, corn syrup, and butter in a medium saucepan. Warm over medium heat, stirring until the sugar dissolves.
Bring to a gentle bubble and cook for 1 minute without stirring.
Remove from heat. Stir in peanut butter, vanilla, and salt until smooth and glossy.
Pour the warm mixture over the corn flakes. Fold gently with a spatula until evenly coated.
Scoop heaping tablespoons onto the prepared sheets. Lightly press to help them hold shape.
Cool at room temperature until set, about 20–30 minutes. Melt chocolate chips and drizzle over cookies if desired.