In a bowl, toss the cauliflower with the melted butter and a pinch of salt and pepper. Place in your casserole dish. Roast for 15 minutes.
In another bowl, mix together the heavy cream, sour cream, 1 cup of shredded cheddar cheese, half the bacon, half the chives, and the amount of salt and pepper that suits you.
Add the roasted cauliflower and mix well.
Place the mixture into the casserole dish. Top with the rest of the cheddar cheese, bacon, and chives. Bake for 20-30 minutes.
Remove from oven and let the casserole rest for 5-10 minutes. Garnish with more chives, if desired, and serve warm.