Preheat oven to 400'
Place clauliflower in a 2 qut broiler safe baking dish lightly coated with cooking spray; coat cauliflower with cooking spray. Sprinkle with 1/4 tsp salt, toss. Bake at 400' for 30 min til almost tender. Cool 5 min.
Melt butter in saucepan over med heat. Remove from heat stir in panko. Stir in 1/4 cup cheese and chives.
Heat saucepan over med hi heat. Coat pan with spray. Add onion, saute 4 min til almost tender, stirring frequently. Add garlic, saute 1 min stirring constantly. Add flour, cook 1 min, stirring constantly. Gradually add milk, stirring with whisk. bring to a boil. Cook 3 min until thick, stirring constantly. Remove from heat; stir in remaining 1/4 cup cheese, remaining 1/4 tsp salt, parsley and pepper. Pour milk mixture over cauliflouwer and toss. Top evenly with cheese mixture. Broil 3 min til golden brown and heated.
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