Preheat the oven to 450 degrees.
Coat a 2-quart baking dish with cooking spray.
Put the cauliflower in a steaming basket above one inch of boiling water.
Cover and steam for 1 minute.
Lift the lid and allow steam to escape for 15 seconds, then cover again and steam for about 7 minutes, until the cauliflower is tender.
Remove from the heat and transfer into ice cold water to stop cooking.
Drain on paper towels, then transfer to the baking dish.
Season with salt and pepper, toss with 2 tablespoons of the oil and half of the thyme.
Spread evenly in a single layer.
Add garlic, goat cheese and milk in a food processor fitted with the steel blade, and blend until smooth.
Add the remaining thyme and freshly ground pepper to taste, and pulse until well blended.
Spread this mixture evenly over the cauliflower.
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