Cauliflower mash can be used for cottage pie topping by adding some grated cheese to it. You can add garlic or parmesan cheese to your cauliflower mash as well.
Cook a chopped up cauliflower head for approximately 10 minutes until tender
Drain and discard the water
Dry cook the cauliflower just to make sure that all the water is gone, the drier the cauliflower the better
Add your cauliflower to your food processor and as you are processing it add cubes of butter to it
Season with salt and pepper