Gather all ingredients.
Bring sugar and corn syrup to a boil in a saucepan over medium heat.
Stir in butter and peanut butter until thoroughly combined, then remove from the heat.
Place cornflakes into a large bowl. Pour peanut butter mixture over top and mix until cornflakes are well coated.
Drop 1-tablespoon scoops of the mixture onto a waxed-paper lined baking sheet. Flatten slightly if desired, then allow to cool for 30 minutes before serving.
