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Melt butter in a large saucepan, over medium heat. Add onion and let cook until translucent, about 10 minutes.
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Add flour and salt and mix well. Let cook for another two minutes.
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Add milk, half and half, chicken brother, and cauliflower and bring to a boil over medium high heat. Cover and reduce heat to low and let simmer for about ten minutes, until cauliflower is tender.
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Put soup in your Wolfgang Puck Commercial Blender and pulse until all the cauliflower is blended and soup is desired consistency.
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Place back in saucepan and heat until hot. Add mustard and cheeses and stir until the cheese is completely melted. Top with extra cheddar cheese and bacon bits, if desired.