Preheat oven to 375 degrees. Spray an 8 x 8 baking dish with non-fat cooking spray.

Using a vegetable steamer, or the microwave, steam cauliflower until tender. Transfer hot cauliflower to blender or food processor and add in butter, half and half, 1 tsp garlic powder, ¼ cup mozzarella cheese, 1/ 2 of the pepperoni slices, and salt & pepper. Puree until smooth.

Pour cauliflower puree into baking dish. Use a spatula to even out the surface. Top with the pizza sauce, and use a spoon or spatula to spread it evenly over the cauliflower, making sure not to mix it into the cauliflower. Top with mozzarella cheese, pepperoni and remaining tsp of garlic powder.

Bake for about 20 minutes.

Let cool for about 10 minutes. Cut into 4 equally sized pieces and serve.