Break or separate the already cooked peanut brittle into 3-4 sections.
Add one section at a time to a medium saucepan. Warm the mixture over low-medium heat, stirring continuously.
Once one section softens, add another until they are all in the saucepan. While the mixture is semi-solid, keep stirring, or it will burn to the bottom of the pan.
When the brittle softens, attach a candy thermometer to the side of the saucepan, ensuring it is fully submerged without touching the bottom. Increase the heat to medium and stir constantly until the temperature reaches 300℉ (149℃).
Carefully spread the cooked mixture onto the reserved baking dish using a wooden spoon to create an even layer.
Set the peanut brittle aside, at room temperature, for at least an hour to harden before breaking it apart.
Notes
Nutrition Disclosure:
The nutritional information shown is an estimate provided by an online nutrition calculator. It should not be considered a substitute for professional advice.