Hi,
I would suggest that if you want to make more than one recipe, you make them one at a time. Peanut Brittle is tricky as it is and you need to work quickly to get it the right thickness. It would be easiest to do it one recipe at a time. I love peanut brittle! Good luck.
http://www.bettycrocker.com/recipes/peanut-brittle/9981470d-528b-4386-9958-d0c963d732f1