INGREDIENTS
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2 tablespoons unsalted butter
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2 pounds fresh broccoli
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1 medium onion, roughly chopped (about 1 cup)
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2 medium garlic cloves, minced (about 2 teaspoons)
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1 1/2 teaspoons dry mustard powder
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pinch cayenne pepper
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salt
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3-4 cups water
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1/4 teaspoon baking soda
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2 cups low-sodium chicken broth
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2 ounces baby spinach
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3 ounces sharp cheddar cheese, shredded (about 3/4 cup)
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1 1/2 ounces Parmesan cheese, grated fine, plus extra for serving
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ground black pepper