To prepare a low carb twice baked cauliflower casserole recipe, first you need to prepare the cauliflower. First, you will need 2 cups of florets of cauliflower, 1 cup of water, and 1 tablespoon of olive oil. You will also need salt, pepper, thyme, oregano, onion powder, garlic powder and cayenne pepper. Mix the ingredients together until they are well combined. Then, pour the mixture into the prepared casserole dish. Bake the casserole for 20 to 25 minutes or until the top is brown and bubbly. Remove from the oven and allow to cool for 5 to 10 minutes before serving.