In a large saucepan, bring 1 in. of water, cauliflower and salt to a boil. Reduce heat; cover and cook for 5-15 minutes or until cauliflower is crisp-tender.
Meanwhile, in a small saucepan, melt butter; stir in flour and thyme until blended. Gradually add milk. Bring to a boil; cook and stir for 2 minutes or until thickened. Reduce heat; add cheese, stirring until melted
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