1. Melt 2 tbsp of butter, in a large bowl, toss together the cauliflower florets with the melted butter. Season with sea salt and black pepper.
2. Preheat oven to 450°F. Line a baking sheet with foil or parchment pepper. Arrange the cauliflower florets on the prepared baking sheet. Roast for about 15 minutes until crisp-tender.
3. Heat the cheddar cheese, heavy cream, milk, and remaining tablespoon of butter in microwave, stir frequently. Heat until the cheese mixture is smooth.
4. Toss cauliflower with cheese sauce.
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