Being a single person (for now), I make a large dish of this and freeze individual portions.

But defrosted portions are soggy UNLESS cauliflower was prepared as follows: Cook florets, drain, put in dehydrator for three hours on 135F degrees, place in food processor and produce macaroni-sized pieces. Then proceed with the recipe.

Cauliflower holds a lot of water, but this takes care of the problem.

I use a large lasagna pan (13 x 9 inches).