Roasted Broccoli Soup With Sharp Cheddar Recipe

The broccoli should come out of the oven smelling toasted, with tender stems and browned tips on the florets. I used to put it straight into the broth, and the…

By Ava
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November 14, 2026
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Reading time: 9 min

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The broccoli should come out of the oven smelling toasted, with tender stems and browned tips on the florets. I used to put it straight into the broth, and the soup tasted mild in a way extra cheddar couldn’t fix. Roasting first gives this roasted broccoli soup with sharp cheddar a deeper flavor, so the cheese can add richness without taking over.

I build the soup in a Dutch oven while the broccoli roasts, then let a russet potato simmer in the broth until it’s soft enough to blend smoothly. Sharp cheddar goes in at the end, a handful at a time, over low heat. The result is a creamy bowl with plenty of broccoli flavor and no floury aftertaste.

The Russet Potato Is Doing the Work a Roux Usually Does

A blended vegetable soup needs something to give it body, or it can feel thin even when the flavor is good. Here, the russet potato supplies that structure. As it simmers, it softens enough to break down with the broccoli and broth, making the finished soup feel creamy without a flour-and-butter base.

That’s why the potato needs to be very tender before you blend. A fork should slide into the pieces without meeting a firm center; if they’re still holding their shape, they haven’t softened enough to disappear into the soup. Once fully cooked, the potato helps the broccoli purée feel cohesive rather than watery, while the cream and cheddar finish the bowl with their own richness.

This also makes the soup easier to keep focused on broccoli. There’s no roux to cook separately, and no flour flavor competing with the roasted vegetables. The potato does its quiet work in the same pot as the broth.

Why the Stems, Broth, and Sharp Cheddar Matter

• Broccoli — The peeled stems belong in the pot along with the florets; they add substance and blend smoothly once tender. Choose broccoli with firm stalks and tight, deep-green florets. There’s no direct swap that gives the same roasted broccoli flavor.
• Olive oil — The oil helps the broccoli roast and gives the onion enough fat to soften without scorching. A basic olive oil works well here; the broccoli and cheddar bring the bigger flavors.
• Yellow onion and garlic — Onion gives the broth a mellow savory base, while garlic adds a sharper note. Fresh garlic has the cleanest flavor; keep the short cook on it so it doesn’t turn bitter.
• Russet potato — Its starch helps the blended soup feel full-bodied. Keep the peel off for the smoothest texture, and use a russet rather than counting on a waxy potato to thicken in quite the same way.
• Low-sodium broth — Chicken broth gives the soup a savory foundation, and vegetable broth makes it vegetarian. Low-sodium broth lets the measured salt season the vegetables and soup without the broth deciding the final salt level.
• Heavy cream — Cream rounds out the sharper notes and gives the soup a soft, rich finish. Milk isn’t an equivalent swap; it makes a thinner soup and is more likely to lose that plush texture.
• Sharp cheddar — The sharpness keeps the cheese present beside the broccoli. Shred it finely so it melts readily into the warm soup; a milder cheese won’t give the same assertive cheddar flavor.

Roast First, Then Build a Smooth Soup in the Dutch Oven

Roast Until the Edges Brown

Heat the oven to 425°F and line two rimmed baking sheets with parchment paper. Toss the broccoli with 2 tablespoons olive oil, 1/2 teaspoon kosher salt, and 1/4 teaspoon black pepper, then spread it in a single layer across the pans. Roast for 20–25 minutes, rotating the sheets and switching their positions halfway through. The florets should be tender with browned edges; if they’re pale, give them the full roasting time.

Soften the Onion Before the Garlic

While the broccoli roasts, heat the remaining 1 tablespoon olive oil in a 5-quart Dutch oven over medium heat. Add the diced onion with the remaining 1/2 teaspoon salt and 1/4 teaspoon pepper, and cook for 5–7 minutes until softened. Stir in the minced garlic and cook for 30 seconds. Keep it moving at this point; garlic can scorch quickly and turn harsh.

Let the Potato Turn Fork-Tender

Add the peeled, diced potato and broth, then bring the pot to a boil. Reduce the heat and simmer for 12–15 minutes, until a fork pierces the potato very easily. Don’t rush this stage: firm potato pieces can leave the purée less smooth. Stir in the roasted broccoli and simmer for 5 minutes so the flavors come together before blending.

Blend Before the Cheddar Goes In

Remove the pot from the heat and carefully blend the soup with an immersion blender until smooth. Keep the blender head submerged to limit splashing, especially when you start it. Return the pot to low heat, stir in the heavy cream, then add the shredded cheddar a handful at a time. Warm gently for 2–3 minutes until the cheese melts, and don’t let the soup boil.

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Roasted Broccoli Soup With Sharp Cheddar Recipe

Roasted broccoli soup with sharp cheddar gets its deep, browned flavor from roasting the florets before simmering them with potato and broth. Blend it smooth, then gently melt in the cheddar and cream for a rich, creamy finish.

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Prep Time 15 minutes mins

Cook Time 52 minutes mins

Total Time 1 hour hr 7 minutes mins

Servings: 6 servings

Course: Dinner

Cuisine: American

Calories: 390

Ingredients Equipment Method Notes

Ingredients

  

• 2 lb broccoli cut into florets with stems peeled and chopped
• 2 tbsp olive oil
• 1 tsp kosher salt divided
• 0.5 tsp black pepper divided
• 1 tbsp olive oil
• 1 yellow onion medium, diced
• 2 cloves garlic minced
• 1 russet potato medium, peeled and diced
• 4 cups low-sodium chicken or vegetable broth
• 0.5 cup heavy cream
• 8 oz sharp cheddar cheese shredded

Equipment

• 2 rimmed baking sheets
• 1 5-quart Dutch oven
• 1 immersion blender

Method

 

1. Heat the oven to 425°F.
2. Line two rimmed baking sheets with parchment paper.
3. Toss the broccoli with 2 tablespoons olive oil, 1/2 teaspoon kosher salt, and 1/4 teaspoon black pepper.
4. Spread the broccoli across the baking sheets in a single layer.
5. Roast the broccoli for 20–25 minutes, rotating the sheets and switching their positions halfway through, until the florets are tender and browned at the edges.
6. Heat the remaining 1 tablespoon olive oil in a 5-quart Dutch oven over medium heat.
7. Add the onion and the remaining 1/2 teaspoon salt and 1/4 teaspoon pepper, and cook for 5–7 minutes until softened.
8. Stir in the garlic and cook for 30 seconds.
9. Add the potato and broth, bring to a boil, reduce the heat, and simmer for 12–15 minutes until the potato is very tender when pierced with a fork.
10. Stir in the roasted broccoli and simmer for 5 minutes.
11. Remove the pot from the heat and carefully blend the soup with an immersion blender until smooth.
12. Return the pot to low heat and stir in the heavy cream and shredded cheddar a handful at a time.
13. Warm gently for 2–3 minutes until the cheese is melted; do not let the soup boil.

Notes

For the smoothest soup, add the cheddar a handful at a time and keep the soup from boiling. Refrigerate leftovers for 3–4 days; freezing is not recommended because the cream and cheese can affect the texture. Use vegetable broth for a vegetarian version.