Thick and Creamy Broccoli Cheddar Soup Recipe

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This broccoli cheddar soup recipe builds a quick roux, simmers the broccoli and carrot until just tender, then melts sharp cheddar off the heat so the base comes out thick and glossy instead of stringy. The cheese goes in last for a reason, and that timing is the difference between a smooth bowl and one dotted with grainy clumps. I keep a loaf of golden garlic bread next to the pot for dipping.

If your last pot went grainy or thin, the fault was almost always heat rather than the cheddar itself. Cheddar above a bare simmer clumps instead of melting smooth, so I pull the pot off the burner for a full 30 seconds before the first handful goes in. The troubleshooting list below covers the other ways this soup goes wrong and how to pull it back.

Ingredients

• 4 tablespoons unsalted butter
• 1 medium yellow onion, finely diced (about 1 cup)
• 3 garlic cloves, minced
• ¼ cup all-purpose flour
• 2 cups low-sodium chicken broth or vegetable broth
• 2 cups half-and-half
• 1 teaspoon Dijon mustard
• 3 cups small broccoli florets (from about 1 large head)
• 1 large carrot, julienned or shredded (about 1 cup)
• 8 ounces sharp or extra-sharp cheddar, freshly grated (about 2 cups)
• ½ teaspoon freshly grated nutmeg (optional)
• ½ teaspoon kosher salt, plus more after the cheese melts
• ½ teaspoon freshly ground black pepper
• ⅛ teaspoon cayenne pepper (optional)

Instructions

1. Sweat the onion: Melt the butter in a Dutch oven or heavy pot over medium heat. Add the onion and ¼ teaspoon of the salt and cook 5 to 6 minutes, stirring now and then, until the onion is soft and translucent but not browned. Stir in the garlic and cook about 1 minute, just until it smells sweet instead of sharp.
2. Cook the roux: Sprinkle the flour over the butter and onions and whisk constantly for 1 to 2 minutes. The roux is ready when it smells toasted, looks a shade darker, and pulls away from the sides of the pot. Cooking it this long is what removes the raw flour taste and thickens the soup later.
3. Whisk in the liquids: Pour in the broth in a slow, steady stream while whisking, then add the half-and-half the same way. Keep whisking until the base is smooth with no flour lumps. Bring it to a gentle simmer with small bubbles at the edge only, and let it cook 3 to 4 minutes until it coats the back of a spoon.
4. Simmer the vegetables: Add the broccoli, carrot, Dijon mustard, black pepper, nutmeg, and cayenne if you’re using them. Simmer on medium-low 12 to 15 minutes, until a carrot shred breaks under light pressure and the broccoli stems pierce easily but the florets are still bright green. Don’t let it boil hard or the dairy can curdle.
5. Check the thickness: If the soup looks thin, simmer it uncovered 3 to 5 minutes to reduce, keeping it at a lazy simmer. If it looks too thick, stir in a splash of broth. Decide now, because the soup can’t be boiled once the cheese is in without breaking.
6. Melt in the cheese off the heat: Take the pot off the burner and wait 30 seconds so the base stops bubbling. Stir in the cheddar one small handful at a time, letting each addition melt fully before the next, until the soup is smooth and glossy. Taste, then add the rest of the salt only if it needs it, since both the cheddar and the broth carry salt.

If the soup turns grainy or stringy

• Grainy or stringy cheese means the pot was too hot. Cheddar breaks above a bare simmer, so pull the pot off the heat and let it sit 30 seconds before the first handful goes in.
• Dull olive-green broccoli comes from simmering past tender at a hard boil. Pull it when the stems give under a fork but the florets still look green.
• Curdled or separated soup means the half-and-half boiled. Keep the pot at a lazy simmer from the moment the dairy goes in.
• A chalky texture comes from bagged pre-shredded cheddar, which is dusted with starch that won’t melt smooth. Grate a block on the large holes just before it goes in.
• Too salty happens fast because cheddar and broth both carry salt. Hold back the salt until the cheese has melted, then taste before adding more.

What I serve with it

• A bowl of classic coleslaw when I want something cold and crunchy against the cheese.
• A square of buttermilk cornbread to dunk if the soup is the whole meal.
• A pot of New England clam chowder for the other cold night when I want a second creamy bowl in rotation.

Storage

Cool the soup, then refrigerate it in an airtight container within 2 hours. It keeps 3 to 4 days in the fridge. Reheat it on the stove over medium-low heat, stirring now and then, and never let it boil or it will separate; a splash of broth loosens it if it tightened up overnight. I don’t freeze this one because the half-and-half and cheddar turn grainy after thawing. USDA leftover food safety guidance covers the 3-to-4-day window I follow for creamy soups.

FAQ

Can I use frozen broccoli?

Frozen broccoli works in this soup, so add it straight from the freezer in step 4 and give it 3 to 4 extra minutes because it drops the pot temperature. The florets are already blanched, so they turn tender without a long simmer.

Can I thicken it without flour?

You can skip the roux and thicken the finished soup with a cornstarch slurry instead, using about 1 tablespoon of cornstarch whisked into 2 tablespoons of cold water and stirred in off the heat. Check that the broth is gluten-free too if that matters for your kitchen.

Can I make it ahead?

You can build the soup through step 5 a day ahead, cool it, and refrigerate it. Reheat it gently on the stove, then melt the cheddar in off the heat just before serving, because the texture is smoothest the first time the cheese goes in.

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