INGREDIENTS
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8 cups steamed broccoli florets [ Around 2 lb]
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8 Tbsp butter, divided
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1 small sweet onion, diced
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⅓ cup all purpose flour
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1 tsp dry mustard
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1 tsp garlic salt
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black pepper to taste
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3 cups whole milk
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3 cups sharp cheddar cheese, divided
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⅔ cup panko bread crumbs
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¼ cup grated Parmesan cheese
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¼ tsp garlic salt