Soups Stews

Charred Green Onion and Cheddar Potato Soup

Name: Charred Green Onion and Cheddar Potato Soup
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Yield: 4 servings
Ingredients: 12 large green onions (about 2 bunches), roots trimmed; 2 tbsp olive oil, divided; 1 tsp Diamond Crystal kosher salt, plus more to taste; 1/2 tsp black pepper, divided; 1 medium yellow onion, diced (about 1 1/2 cups); 4 garlic cloves, minced; 1/2 tsp smoked paprika; 1/4 tsp cayenne pepper; 2 lbs Yukon Gold potatoes, peeled and cut into 1-inch chunks; 4 cups low-sodium chicken stock; 1 cup whole milk; 6 oz sharp cheddar block, shredded (about 1 1/2 cups), plus more for serving; 2 tbsp unsalted butter; 1 tbsp apple cider vinegar; 1/4 cup sour cream, for serving; 2 tbsp thinly sliced green onion tops, for garnish

A thick, smoky potato soup with broiler-charred green onions and sharp cheddar. Ready in 60 minutes, weeknight-friendly.

By Brian · Published May 21, 2026

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Charred Green Onion and Cheddar Potato Soup

Potato soup has a tendency to be wallpaper paste — starchy, flat, and boring. This version fixes that by charring whole green onions under the broiler until blackened at the tips and jammy at the base, then blending half of them directly into the soup. That step alone gives the broth a subtle smokiness and a low, savory sweetness that no amount of dried onion powder can replicate.

The base is simple: Yukon Gold potatoes (they break down creamier than russets without going gluey), chicken stock, and sharp cheddar stirred in at the end. Keep the heat low when you add the cheese or it'll seize and go grainy — that's the one step that trips people up. Serve this on a weeknight with crusty bread, or make it through step 3 two days ahead and finish it the night you need it. It thickens as it sits, so thin it with a splash of stock when reheating.

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🕐 Prep: 20 min | 🔥 Cook: 40 min | ⏱️ Total: 60 min

Ingredients

Servings 4

▸ 12 large green onions (about 2 bunches), roots trimmed
▸ 2 tbsp olive oil, divided
▸ 1 tsp Diamond Crystal kosher salt, plus more to taste
▸ 1/2 tsp black pepper, divided
▸ 1 medium yellow onion, diced (about 1 1/2 cups)
▸ 4 garlic cloves, minced
▸ 1/2 tsp smoked paprika
▸ 1/4 tsp cayenne pepper
▸ 2 lbs Yukon Gold potatoes, peeled and cut into 1-inch chunks
▸ 4 cups low-sodium chicken stock
▸ 1 cup whole milk
▸ 6 oz sharp cheddar block, shredded (about 1 1/2 cups), plus more for serving
▸ 2 tbsp unsalted butter
▸ 1 tbsp apple cider vinegar
▸ 1/4 cup sour cream, for serving
▸ 2 tbsp thinly sliced green onion tops, for garnish

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Rimmed half sheet pan

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5-quart Dutch oven or heavy-bottomed pot

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Instructions

Char the Green Onions

1. Position an oven rack 4 inches below the broiler element and set the broiler to high. Toss the whole green onions with 1 tablespoon of olive oil and spread them in a single layer on a rimmed half sheet pan. Sprinkle with 1/4 teaspoon kosher salt. Broil for 6–8 minutes, flipping once halfway through, until the tips are blackened and the white bases are jammy and caramelized — you'll smell a smoky-sweet onion aroma and see char marks on at least a third of the surface area. Remove and let cool for 5 minutes.
2. Once cool enough to handle, roughly chop the charred green onions. Set aside half for blending into the soup and half for stirring in as texture later.

Build the Base

1. Heat the remaining 1 tablespoon olive oil and 2 tablespoons butter in a 5-quart Dutch oven over medium heat. Add the diced yellow onion and 1/4 teaspoon kosher salt. Cook, stirring occasionally, for 8–10 minutes until the onion is soft, translucent, and just starting to turn golden at the edges — it should look glossy and smell sweet.
2. Add the minced garlic, smoked paprika, and cayenne. Stir constantly for 60 seconds until fragrant and the garlic is no longer raw-smelling — it will darken slightly and stick to the bottom of the pot in a thin fond. Don't let it burn.
3. Add the Yukon Gold potato chunks and stir to coat them in the aromatics, about 30 seconds. Pour in the chicken stock. Increase heat to medium-high and bring to a boil — you should hear vigorous bubbling and see small waves across the surface, about 5 minutes.

Simmer and Blend

1. Reduce heat to medium-low. Add the half of the charred green onions reserved for blending. Simmer uncovered for 18–22 minutes until the potatoes are fully tender — a fork should slide through a chunk with zero resistance, and the stock will have reduced slightly and turned slightly opaque.
2. Remove the pot from heat. Using an immersion blender, blend the soup until smooth and creamy, about 60–90 seconds. Alternatively, transfer in batches to a countertop blender, filling it no more than halfway, holding the lid down with a folded towel. The blended soup should be thick enough to coat the back of a spoon in a visible layer.
3. Return the pot to medium-low heat. Stir in the whole milk and bring back to a gentle simmer — small bubbles at the edges, not a full boil. Taste and adjust salt and the remaining 1/4 teaspoon black pepper.

Finish and Serve

1. Remove the pot completely from heat. Wait 60 seconds, then add the shredded cheddar in three additions, stirring vigorously after each handful until fully melted and incorporated. The soup should turn a pale amber-gold and look glossy rather than grainy. If the cheese seizes, see pro tips below.
2. Stir in the apple cider vinegar and the reserved chopped charred green onions. Taste — it should have a distinct smoky note from the onions, sharpness from the cheddar, and a bright finish from the vinegar. Adjust seasoning as needed.
3. Ladle into bowls. Top each with a spoonful of sour cream, a pinch of extra shredded cheddar, and a few sliced green onion tops. Serve immediately.

Cook's Notes

Don't skip the broiler step — the charred green onions are the flavor backbone of the soup. If they look pale when they come out, put them back under the broiler for 2 more minutes.
Use block cheddar, not pre-shredded. Bag shredded cheddar has anti-caking coatings that prevent smooth melting and leave the soup with a gritty texture.
The soup keeps in the fridge for up to 4 days. Store it without the sour cream topping. It will thicken considerably — thin with 2–3 tablespoons of stock per cup when reheating.
For a smoother texture, strain the blended soup through a fine mesh sieve before adding the milk. This is optional but makes a noticeably silkier result.
The apple cider vinegar at the end is not optional — it cuts the starchiness and makes the cheddar flavor pop. Don't leave it out.

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Pro Tips

→ If the cheddar breaks and turns grainy, reduce the heat to the lowest setting, add 1 tablespoon of whole milk, and whisk aggressively in small circles. It usually comes back together within 30 seconds — the added fat from the milk re-emulsifies the broken sauce.
→ The two-stage charred onion technique — half blended in, half stirred in at the end — gives you both depth of flavor in the base and textural contrast in the finished bowl. Don't combine them all into one step.
→ Over-blending Yukon Golds can release too much starch and make the soup gluey, even with an immersion blender. Blend just until smooth; don't run the blender for more than 90 seconds at a stretch.
→ If your soup tastes flat even after seasoning, it's almost always the acid. A full tablespoon of apple cider vinegar (double the recipe amount) might be needed depending on your stock. Add it in 1/2 teaspoon increments and taste as you go.
→ When using a countertop blender for hot soup, remove the plastic insert from the lid and cover the opening with a folded kitchen towel instead. Steam builds pressure fast and can blow the lid off, sending hot soup across the kitchen.
→ For a deeper char flavor, roast the green onions the night before and store them refrigerated. A rested char develops more complexity than one used immediately — the sugars continue to caramelize as they cool.

What to Serve With This

A crisp, lightly bitter beer cuts right through the richness of the cheddar base — a pale ale like Sierra Nevada Pale Ale or a Czech pilsner works well here. The carbonation cleanses the palate between spoonfuls and the mild bitterness offsets the starchy, creamy body of the soup without overwhelming it.

If you want wine, go for a dry, unoaked Chardonnay or a white Burgundy. Both have enough acidity to lift the soup and enough body to stand up to the cheddar. Avoid anything too fruity or oak-heavy — it'll clash with the charred onion notes.

For a non-alcoholic option, sparkling water with a squeeze of lemon does the same work as the beer: acid and bubbles reset the palate. A cold glass of apple cider (the dry, not-from-concentrate kind) also pairs surprisingly well — the apple's tartness echoes the green onion's bite.

On the side, serve thick slices of sourdough or the No-Knead Dutch Oven Bread toasted in butter. A simple green salad dressed with red wine vinegar and Dijon balances the soup's weight. Avoid anything creamy alongside — you don't need two rich dishes on the same plate.

Variations & Substitutions

To make this vegetarian, swap the chicken stock for a good vegetable stock — use 4 cups of a full-bodied one like Imagine Organic No-Chicken Broth, which has more depth than standard veggie stock. Everything else stays the same. The charred green onions carry enough complexity that you won't miss the chicken stock.

For a dairy-free version, skip the cheddar and stir in 3 tablespoons of nutritional yeast and 1 tablespoon of white miso paste at the finish. Use full-fat oat milk (like Oatly Barista) in place of any dairy added for creaminess. The miso gives you the salty, savory depth that cheddar usually provides.

To make it heartier for a larger crowd or for meal prep, add 1 cup of roughly chopped cooked bacon or pancetta at the end, stirred in just before serving. You can also bulk it up with 1 can (15 oz) of drained white beans blended in with the potatoes — adds protein and makes the texture even creamier without extra dairy.

For a spicy version, add 1 finely minced chipotle pepper in adobo sauce to the pot along with the garlic in step 2. It amplifies the charred onion notes and gives the whole pot a smoky heat that builds slowly. Reduce the cheddar to 3/4 cup so the chipotle flavor isn't buried.

Frequently Asked Questions

Can I use russet potatoes instead of Yukon Golds? ▼

You can, but the texture will be noticeably different. Russets are starchier and tend to make the soup gluey if over-blended. If you use russets, blend only half the soup and leave the rest chunky. Yukons give you a naturally creamier, smoother result without as much risk.

Why did my cheddar turn grainy and clump? ▼

The soup was too hot when you added it. Take the pot completely off the heat, let it sit for 60–90 seconds, then stir in the cheese in small handfuls. High heat causes the proteins in cheddar to seize and separate from the fat. If it's already broken, whisk in a tablespoon of cream and keep the heat very low — it often comes back together.

Can I make this soup ahead of time? ▼

Yes — cook through the blending step, cool completely, and refrigerate for up to 3 days without adding the cheese. Reheat gently on the stovetop over medium-low, then stir in the cheddar off the heat just before serving. This keeps the cheese from breaking during multiple heatings.

Can I freeze this soup? ▼

Freeze it before adding the cheese. Potato soups with dairy don't freeze well — the texture turns grainy and the fat separates on thawing. Cool the blended base completely, freeze in airtight containers for up to 2 months, then thaw overnight in the fridge, reheat gently, and finish with the cheddar fresh.

How do I reheat leftovers without the soup getting too thick? ▼

Add a splash of chicken stock or water — start with 2 tablespoons per cup of soup — and stir over medium-low heat. Don't rush it with high heat or the cheese will break. The soup thickens significantly in the fridge overnight, so thinning it is expected, not a sign something went wrong.

What if I don't have a broiler or can't char the green onions? ▼

Use a dry cast iron skillet on the highest heat your stove allows. Lay the whole green onions flat and press them down with a spatula. Cook undisturbed for 2–3 minutes per side until deeply charred in spots. It won't be identical to the broiler result, but it gets close.

Can I use pre-shredded bagged cheddar? ▼

Avoid it. Pre-shredded cheddar is coated in anti-caking agents (usually potato starch or cellulose) that prevent it from melting smoothly. Block cheddar shredded on a box grater melts into the soup evenly. Cabot Sharp Cheddar or Tillamook Medium Cheddar are good choices.

How do I scale this recipe to serve 8? ▼

Double every ingredient and use a 6-quart pot. Broil the green onions in two batches — overcrowding the pan causes steaming instead of charring. Blending time will be longer; use an immersion blender for large batches to avoid overfilling the countertop blender. Everything else scales linearly.

What toppings work well on this soup? ▼

Thinly sliced raw green onion tops, a small pile of extra shredded cheddar, sour cream, crispy bacon bits, or a drizzle of chili oil all work. Keep toppings crunchy or acidic to contrast the creamy base. Avoid heavy toppings that sink and go soggy, like croutons made from soft bread.

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