Make the cauliflower:
Preheat oven to 400°F. Arrange cauliflower on a sheet tray and drizzle with oil. Sprinkle with salt, pepper, and garlic powder; toss. Bake 10 minutes, then toss and bake for 10 minutes more, or until golden.
Make the sauce:
Combine all ingredients except parsley in a large saucepan. Whisk over low heat until creamy and cheese has melted. Add cauliflower directly into the pot with cheese sauce; stir to coat. To serve, scrape into a shallow bowl and top with additional black pepper and chopped parsley.
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