Is toffee supposed to bubble

Yes, toffee is supposed to bubble during the cooking process. As the sugar melts and caramelizes, it creates bubbles from the steam released, indicating that moisture is evaporating. This bubbling is a sign that the mixture is reaching the right temperature for toffee, which typically requires cooking to a hard crack stage. However, once cooled, toffee should have a smooth, hard texture without bubbling.