*To rice the cauliflower, I use the grater attachment on my food processor to make it go lickity split. I find that one normal large head of cauliflower will yield about 8 cups, which I divide in half and refrigerate the other (works well in place of rice for fried rice too!). You can also use a standard box grater if you do not have a food processor.
**I usually just use one and add extra mushrooms and broccoli (and sometimes I like to add chopped kale too), but you can certainly use two if you want more chicken in there! To poach chicken, I will put the raw chicken in a pot and cover with water. Sometimes I will add some celery or onion to the water as well to help season the chicken, and then let it simmer 25-30 minutes, until cooked through. Alternatively, you could use some leftover roasted chicken, or make it extra easy and use a precooked rotisserie chicken! If you go that route though, I would decrease the amount of salt in the recipe.