If you have ever eaten a whole head of garlic and thought, I want more, this soup is your reward. Roasting three heads low and slow mellows the sharp bite into a nutty, jammy sweetness, so you get deep garlic flavor without the fire.
The base is simple: roasted garlic squeezed from its papery skins, softened onions, a splash of white wine, and a little potato to give the broth body. A short simmer and a quick blend turn those humble parts into something that tastes like it took all day.
I keep this in my winter rotation because it is cheap, forgiving, and freezer-friendly. Serve it with crusty bread and a drizzle of olive oil and it feels like a restaurant bowl made from pantry staples.
Why You'll Love This Recipe
About the Ingredients
3 whole heads garlic (about 45 cloves), tops sliced off
Look for firm, tight heads with no green sprouts, which taste bitter. If you are short on time, use 1 1/2 cups peeled garlic cloves instead and roast them on a sheet pan.
3 tablespoons olive oil, divided
Use regular (not extra-virgin) olive oil for roasting since it handles heat better. Avocado oil is a fine swap if you want a neutral flavor.
1 large yellow onion (about 2 cups), thinly sliced
Yellow onion gives the sweetest base; sweet Vidalia works too. Skip red onion, which turns the soup an unappetizing gray-purple.
1 medium russet potato (about 10 ounces), peeled and cubed
Russet breaks down into the silkiest body; Yukon Gold is a creamier substitute if that is what you have.
4 cups low-sodium vegetable or chicken broth
Low-sodium lets you control the salt at the end. For a richer soup, use chicken broth; for vegan, choose a good vegetable stock.
1/2 cup dry white wine or extra broth
Dry unoaked white like Pinot Grigio adds acidity; swap in extra broth plus 1 tablespoon lemon juice if avoiding alcohol.
1 teaspoon fresh thyme leaves, plus more to garnish
Fresh thyme pairs beautifully with roasted garlic; 1/2 teaspoon dried thyme works if rubbed between your fingers first.
1/2 teaspoon kosher salt, plus more to taste
Kosher salt is less salty by volume than table salt, so taste before adding more at the end.
1/4 teaspoon freshly ground black pepper
Fresh-cracked pepper blooms in the hot soup; pre-ground works but add a pinch more.
1/4 cup heavy cream or full-fat coconut milk (optional)
Adds a touch of luxury; coconut milk keeps it dairy-free and adds a subtle sweetness. Omit for a lighter broth.
Crusty bread and olive oil, for serving
A torn baguette is ideal for dunking; garlic-rubbed toast takes it over the top.
Tips & Tricks
Do not rush the roast
Garlic needs a full 40 minutes at 400 F (200 C) to turn jammy and sweet; pulling it early leaves a sharp, raw bite in the soup.
Squeeze, do not chop
Roasted cloves slip right out of their skins when squeezed from the root end; chopping them wastes the soft texture and leaves papery bits behind.
Blend carefully with hot liquid
Fill the blender no more than halfway and vent the lid so steam escapes, or use an immersion blender right in the pot to avoid splatters.
Pro Tips
Step-by-Step Instructions
1. Heat the oven
Preheat the oven to 400 F (200 C) and line a small baking dish with foil.
2. Roast the garlic
Slice the top quarter off each garlic head, set them cut-side up in the dish, drizzle with 1 tablespoon olive oil, and seal the foil. Roast for 40 minutes until the cloves are golden brown and a knife slides in with no resistance.
3. Soften the onions
While the garlic roasts, warm the remaining 2 tablespoons oil in a large pot over medium heat. Add the onion and 1/2 teaspoon salt and cook for 8 to 10 minutes, stirring, until soft and translucent with golden edges.
4. Bloom the thyme
Stir in the thyme and cook for 30 seconds until fragrant, then pour in the wine and scrape up any browned bits.
5. Simmer the soup
Add the potato and broth, bring to a boil, then reduce to a simmer. Cook for 15 minutes until the potato cubes mash easily against the side of the pot.
6. Add the roasted garlic
Squeeze the roasted cloves from their skins directly into the pot, discarding the papery husks, and stir to combine.
7. Blend until silky
Remove from heat and blend with an immersion blender until completely smooth, about 1 minute, or blend in batches in a countertop blender.
8. Finish and season
Stir in the cream if using, then taste and adjust salt and pepper. Ladle into bowls, drizzle with olive oil, and top with fresh thyme and crusty bread.
Delicious Variations
Creamy Potato-Leek Garlic Soup
Swap the onion for 2 leeks and add an extra potato for a thicker, sweeter bowl.
Spicy Chili-Garlic Soup
Add 1/2 teaspoon red pepper flakes with the thyme and finish with a swirl of chili oil.
Roasted Garlic Tomato Soup
Stir in one 14-ounce can of crushed tomatoes with the broth for a bright, tangy twist.
How to Store Roasted Garlic Soup
Refrigerator
Store in an airtight container for up to 4 days; the flavor deepens after a day.
Freezer
Freeze in portions for up to 3 months; leave 1 inch of headspace and thaw overnight in the fridge.
Reheating
Warm gently over medium-low heat, stirring, and add a splash of broth or water if it thickens too much.
Frequently Asked Questions
Q: Is roasted garlic soup healthy?
Yes, it is relatively light at about 285 calories per serving and delivers fiber, vitamin C, and antioxidants from the garlic and onion. The optional cream adds fat, so omit it for a leaner bowl.
Q: Can I make roasted garlic soup without cream?
Absolutely. The blended potato gives the soup a naturally creamy body, so the cream is optional. For a dairy-free version, use coconut milk or skip it entirely and finish with olive oil.
Q: How do I roast garlic for soup?
Slice off the top quarter of each head, drizzle with olive oil, wrap in foil, and roast at 400 F (200 C) for 40 minutes until the cloves are soft and golden. Squeeze the cloves out of their skins once cool enough to handle.
Q: Does roasted garlic soup taste strongly of garlic?
It tastes deeply of garlic but in a mellow, sweet way rather than a sharp, raw way. Roasting converts harsh compounds into sugars, so three heads taste rich, not overpowering.
Q: Can I use pre-peeled garlic instead of whole heads?
Yes. Roast about 1 1/2 cups of peeled cloves tossed in oil on a sheet pan at 400 F (200 C) for 20 to 25 minutes until golden. They may cook faster, so check at 20 minutes.
If you make this roasted garlic soup, I would love to hear how it turned out. Leave a comment below, snap a photo of your bowl, and tag me so I can see your garlicky masterpiece.
Roasted Garlic Soup
Roasted Garlic Soup turns three whole heads into a silky, sweet-savory bowl that's gentle on your breath and big on comfort.
🧂 Ingredients
- 3 whole heads garlic (about 45 cloves), tops sliced off
- 3 tablespoons olive oil, divided
- 1 large yellow onion (about 2 cups), thinly sliced
- 1 medium russet potato (about 10 ounces), peeled and cubed
- 4 cups low-sodium vegetable or chicken broth
- 1/2 cup dry white wine or extra broth
- 1 teaspoon fresh thyme leaves, plus more to garnish
- 1/2 teaspoon kosher salt, plus more to taste
- 1/4 teaspoon freshly ground black pepper
- 1/4 cup heavy cream or full-fat coconut milk (optional)
- Crusty bread and olive oil, for serving
📋 Instructions
- 1Heat the oven — Preheat the oven to 400 F (200 C) and line a small baking dish with foil.
- 2Roast the garlic — Slice the top quarter off each garlic head, set them cut-side up in the dish, drizzle with 1 tablespoon olive oil, and seal the foil. Roast for 40 minutes until the cloves are golden brown and a knife slides in with no resistance.
- 3Soften the onions — While the garlic roasts, warm the remaining 2 tablespoons oil in a large pot over medium heat. Add the onion and 1/2 teaspoon salt and cook for 8 to 10 minutes, stirring, until soft and translucent with golden edges.
- 4Bloom the thyme — Stir in the thyme and cook for 30 seconds until fragrant, then pour in the wine and scrape up any browned bits.
- 5Simmer the soup — Add the potato and broth, bring to a boil, then reduce to a simmer. Cook for 15 minutes until the potato cubes mash easily against the side of the pot.
- 6Add the roasted garlic — Squeeze the roasted cloves from their skins directly into the pot, discarding the papery husks, and stir to combine.
- 7Blend until silky — Remove from heat and blend with an immersion blender until completely smooth, about 1 minute, or blend in batches in a countertop blender.
- 8Finish and season — Stir in the cream if using, then taste and adjust salt and pepper. Ladle into bowls, drizzle with olive oil, and top with fresh thyme and crusty bread.