That is the recipe. Spark gives me trouble with links sometimes, so if it doesn't work if you google sugarfreemom pizza cauliflower casserole it comes up. She also has a enchilada and cheeseburger version.
I will say this, I was not at all impressed with the fact it was 365 calories for 1/10th of that casserole. Those portions are BEYOND small and for the calories I did not feel they were worth it. In mine I used the cauliflower and the 2 cups of mozzarella cheese, but I used 1 lb of ground turkey and 20 turkey pepperonis. I divided my casserole into 6 servings which were much more realistic and my calorie count was 250 per serving.