creamy roasted onion soup

Published on November 29, 2025
4.8 (245 reviews)

There’s something magical about the aroma of onions turning caramel‑brown in the oven. It reminds me of chilly evenings when my grandmother would ladle a steaming bowl of soup into waiting bowls, each

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creamy roasted onion soup
Prep Time
15 min
Cook Time
45 min
Servings
4

Why You'll Love This Recipe

✓ Deep Caramel Flavor: Roasting the onions until golden brings a natural sweetness that makes the soup richer than any store‑bought version.
✓ Velvety Texture: Blending the roasted onions with cream creates a silky mouthfeel without needing heavy flour thickeners.
✓ One‑Pan Simplicity: All steps happen in the same roasting pan, so cleanup is minimal and flavors stay locked in.

There’s something magical about the aroma of onions turning caramel‑brown in the oven. It reminds me of chilly evenings when my grandmother would ladle a steaming bowl of soup into waiting bowls, each sip warming the soul. This creamy roasted onion soup captures that nostalgic comfort while adding a modern, velvety finish that feels indulgent yet surprisingly light. It’s perfect as a starter for a dinner party or a cozy solo meal, delivering depth of flavor without the fuss of multiple pots. Let the sweet‑savory perfume fill your kitchen and prepare for a bowl that truly hugs you from the inside out.

3 Tbsp olive oil Any neutral oil works if you prefer.
2 cups vegetable broth Low‑sodium for better seasoning control.
1 cup heavy cream Half‑and‑half can replace for a lighter version.
2 tsp fresh thyme leaves Dried thyme works, use ½ tsp.
½ tsp smoked paprika Adds a gentle smoky note.
¼ cup dry sherry (optional) Adds acidity and depth; omit for a non‑alcoholic version.
Salt and freshly ground black pepper Season to taste at the end.

Instructions

creamy roasted onion soup
1

Roast the onions

Preheat the oven to 425°F (220°C). Toss sliced onions with olive oil, salt, and smoked paprika on a large rimmed sheet. Spread in a single layer and roast 25‑30 minutes, stirring halfway, until deep golden and fragrant.

Pro Tip: Add a splash of water to the pan if onions begin to stick; steam helps caramelize evenly.
2

Deglaze the pan

Transfer roasted onions to a large pot. Pour in the sherry (if using) and stir, scraping up any browned bits. Let the alcohol evaporate for 1‑2 minutes, then add the vegetable broth.

Pro Tip: If you omit sherry, substitute an extra tablespoon of broth and a dash of balsamic vinegar.
3

Simmer and blend

Bring the mixture to a gentle boil, then reduce to a simmer for 10 minutes to meld flavors. Use an immersion blender to puree until completely smooth, or transfer to a countertop blender in batches.

Pro Tip: Blend while the soup is hot; this prevents splattering and yields a silkier texture.
4

Add cream and herbs

Stir in the heavy cream and fresh thyme. Warm the soup over low heat just until the cream is incorporated; avoid a rapid boil to keep the texture velvety. Season with salt and pepper to taste.

Pro Tip: Add a teaspoon of lemon zest for a bright finishing note.
5

Serve

Ladle the soup into warmed bowls. Garnish with a drizzle of extra cream, a sprinkle of fresh thyme, and a few croutons if desired. Enjoy immediately while hot.

Pro Tip: A thin slice of toasted baguette adds a pleasant crunch.

Expert Tips

Tip #1: Uniform Slices

Slice onions evenly (about ½ inch thick) so they caramelize at the same rate, preventing burnt edges and ensuring consistent flavor.

Tip #2: Low‑Heat Finish

When adding cream, keep the heat low; a gentle simmer preserves the silky texture and prevents the cream from curdling.

Tip #3: Flavor Boost

A splash of sherry or dry white wine added after deglazing adds acidity and depth without overwhelming the onion’s natural sweetness.

Storage & Variations

Store leftovers in an airtight container in the refrigerator for up to 3 days; reheat gently on the stove, adding a splash of broth if thickness increases. For a vegan version, replace cream with coconut milk and use vegetable broth fortified with mushroom umami. Add roasted garlic or a pinch of curry powder for an adventurous twist.

Nutrition

Per serving

Calories
320 kcal
Protein
6 g
Fat
22 g
Carbs
18 g

Frequently Asked Questions

Absolutely. Fresh thyme adds a brighter note; use about 2 times the amount of dried thyme. Add it at the end of cooking to preserve its flavor.

Blend the soup while it’s hot and smooth; a high‑speed immersion blender works best. If the soup feels too thick, thin it with a little extra broth before adding cream.

Yes. Cool the soup completely, then store in freezer‑safe containers for up to 2 months. Thaw in the fridge and reheat gently, adding a splash of broth if needed to restore creaminess.

Recipe Summary

Prep
30 min
Cook
30 min
Total
60 min
Servings
3
Category: Dinner Recipes
Cuisine: International
Difficulty: Easy
Course: Main
Quick Tips
  • Make ahead friendly
  • Freezer safe 3 months
  • Easily doubled
  • Customizable

Ingredients

  • 4 large yellow onions (about 2 lb)
  • 3 Tbsp olive oil
  • 2 cups vegetable broth
  • 1 cup heavy cream
  • 2 tsp fresh thyme leaves
  • ½ tsp smoked paprika
  • ¼ cup dry sherry (optional)
  • Salt and freshly ground black pepper

Instructions

1
Roast the onions

Preheat the oven to 425°F (220°C). Toss sliced onions with olive oil, salt, and smoked paprika on a large rimmed sheet. Spread in a single layer and roast 25‑30 minutes, stirring halfway, until deep g...

2
Deglaze the pan

Transfer roasted onions to a large pot. Pour in the sherry (if using) and stir, scraping up any browned bits. Let the alcohol evaporate for 1‑2 minutes, then add the vegetable broth....

3
Simmer and blend

Bring the mixture to a gentle boil, then reduce to a simmer for 10 minutes to meld flavors. Use an immersion blender to puree until completely smooth, or transfer to a countertop blender in batches....

4
Add cream and herbs

Stir in the heavy cream and fresh thyme. Warm the soup over low heat just until the cream is incorporated; avoid a rapid boil to keep the texture velvety. Season with salt and pepper to taste....

5
Serve

Ladle the soup into warmed bowls. Garnish with a drizzle of extra cream, a sprinkle of fresh thyme, and a few croutons if desired. Enjoy immediately while hot....

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