Hi: Thanks for your question. Our package directions tell you how to make two packages together in a 3-quart casserole. I think you would be better off making the potatoes as directed, just two packages at a time. But you could put two casseroles in the oven at the same time. If you try to bake more in the casserole, you might not get the potatoes to get done or the liquid to absorb properly. If you have a large enough oven, and enough 3-quart casseroles, you could get them all in at the same time.
Here is what the package says:
Use two packages and double all other ingredients. Bake in 3-quart casserole about 30 minutes.
Answered 12/13/2012 by Marcia-BettyCrocker