01 - Set the oven temperature to 400°F.
02 - Slice the top off the garlic bulb to expose the cloves, drizzle with olive oil, wrap in foil and roast for 30 to 35 minutes until soft and golden. Allow to cool slightly.
03 - Steam cauliflower florets over simmering water for 12 to 15 minutes, until tender upon piercing with a fork.
04 - Squeeze the softened garlic cloves from their skins.
05 - Combine steamed cauliflower, roasted garlic, butter, cream cheese, and milk in a food processor or bowl. Blend or mash thoroughly until smooth and creamy.
06 - Add salt and black pepper to taste, adjusting seasoning as preferred.
07 - Transfer the mixture to a serving dish, garnish with chopped chives if desired, and serve warm.