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Preheat oven to 350F/180C.
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Cut out stem and core from cauliflower, and cut into small pieces.
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Steam until cauliflower is tender, but not overly soft.
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Drain well and mash with potato masher or use a food processor if you don't want chunks.
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Mix in cream cheese, sour cream, green onion, Parmesan, and 3/4 of the crumbled bacon.
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Spread evenly in a medium-sized glass casserole dish.
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Sprinkle with cheddar cheese and reserved bacon.
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Bake 30-35 minutes, or until hot and bubbly