In a medium sized saucepan, combine butter, sugar, and Karo syrup and heat over medium-high heat.
Bring to a boil, and let boil for 5 minutes, or until you reach 225 degrees, if you want to cook with a Candy Thermometer, though this is not necessary.
Do not cook too long or it will get harder.
Pour Corn Puffs into a big bowl, pour syrup over the top, stir, let cool and enjoy!