Preheat oven to 425ยบ and line a baking sheet with parchment paper. Finely grate cauliflower and transfer to a large bowl. Microwave on high, 8 minutes. Drain thoroughly with paper towels or a cheesecloth until mixture is dry.
Add egg, cheddar, and garlic powder to cauliflower bowl and season with salt and pepper. Mix until combined.
Form cauliflower into toast shapes on prepared baking sheet and bake until golden, 18 to 20 minutes.
Transfer to a plate and top with desired toppings, like mashed avocado, a fried egg, or bacon, lettuce and tomato.
Recipe by Slim Pickins at https://www.slimpickins.org/2018/09/01/cauliflower-toast/