Creamy Cauliflower and Broccoli Soup

Featured in: Hearty Soups & Stews

This hearty vegetable soup combines the mild sweetness of cauliflower and broccoli in a smooth, creamy base. Aromatic vegetables like onion, celery, and carrots build depth, while dried thyme and oregano add earthy notes. The soup simmers until vegetables are meltingly tender, then gets blended to silky perfection. A splash of milk creates luxurious texture without heaviness. Homemade croutons, baked until golden and crisp, provide essential crunch. Fresh parsley and optional grated cheese finish each bowl beautifully. The result is a nourishing, satisfying dish perfect for lunch or dinner, especially on cold days when you need something warming and substantial.

Updated on Tue, 27 Jan 2026 13:51:00 GMT
Creamy Cauliflower and Broccoli Soup with golden croutons served steaming hot in a rustic bowl. Save to Pinterest
Creamy Cauliflower and Broccoli Soup with golden croutons served steaming hot in a rustic bowl. | frostkettle.com

There's something about the sound of vegetables hitting hot oil that signals comfort is coming. My neighbor stopped by on a grey afternoon asking if I had soup, and I had nothing but cauliflower, broccoli, and the kind of determination that comes from an empty fridge. Two hours later, she was scraping the bowl clean and asking for the recipe, which at that moment was just instinct and memory. This soup became our winter ritual after that, the kind of thing I make when the kitchen needs to feel warm again.

I made this for my daughter's friend who claimed to hate vegetables, and she had seconds. She was suspicious at first, poking at the broccoli pieces, but once she tasted that creamy, herbaceous warmth, the whole bowl disappeared. Sometimes the quietest moments around the table say more than any compliment.

Ingredients

  • Cauliflower and Broccoli: Buy them fresh and cut your own florets if you can—they'll cook more evenly and the kitchen smells amazing while you're prepping.
  • Onion, celery, and carrots: This holy trinity builds the foundation of flavor, so don't skip the step of letting them soften properly in the oil.
  • Garlic: Mince it fresh and add it after the softer vegetables so it doesn't burn and turn bitter.
  • Vegetable broth: Quality matters here—it's the backbone of the soup, so use one you actually taste on its own.
  • Milk: Whole milk creates the richest texture, but plant-based versions work just as well if you need them to.
  • Olive oil: Use good oil for the croutons especially; it's where you taste it most.
  • Dried thyme and oregano: These herbs are forgiving and work together like old friends, giving the soup that familiar, comforting flavor.
  • Bread for croutons: Crusty bread with structure holds up to toasting without turning into dust.

Instructions

Product image
Keep air fryer baskets clean while cooking wings, vegetables, and snacks with easy nonstick cleanup.
Check price on Amazon
Toast your croutons first:
Start the oven and get your bread cubes crisping while you prep vegetables—this way they'll be golden and waiting when you need them. Toss them with oil, garlic powder, and salt, spread thin so they don't steam, and watch them turn the color of honey.
Build your flavor base:
Heat olive oil in a large pot over medium heat, then add the onion, celery, and carrots together. Let them soften for a solid five minutes, stirring occasionally, until the onion turns translucent and the whole pot smells like the start of something good.
Wake up the herbs:
Once vegetables are soft, add your minced garlic along with the thyme and oregano. Cook for just one minute—you want the garlic fragrant and distributed, not browned.
Introduce the main vegetables:
Add your cauliflower and broccoli florets to the pot and let them cook for a couple of minutes, stirring gently so they're coated in the flavored oil. This helps them absorb the herbal notes before the liquid goes in.
Simmer until tender:
Pour in your vegetable broth, bring everything to a boil, then reduce heat and cover. Simmer for 15 to 20 minutes until the vegetables are genuinely soft when you poke them with a fork—this is when they're ready to become creamy.
Blend to smoothness:
Remove the pot from heat and use an immersion blender, moving it through the soup in steady motions until it reaches a velvety consistency. If you prefer it thinner, blend less; if you want it silk-smooth, take your time.
Finish gently:
Stir in the milk, taste it, and season with salt and pepper to your preference. Reheat gently if needed, but don't let it boil once the milk is in.
Serve with joy:
Ladle into bowls and crown each one with those crispy croutons, a sprinkle of fresh parsley, and cheese if the moment feels right.
Product image
Keep air fryer baskets clean while cooking wings, vegetables, and snacks with easy nonstick cleanup.
Check price on Amazon
Topped with fresh parsley and cheese, this Cauliflower and Broccoli Soup is perfect for chilly evenings. Save to Pinterest
Topped with fresh parsley and cheese, this Cauliflower and Broccoli Soup is perfect for chilly evenings. | frostkettle.com

There was a moment, years later, when my son made this soup on his own for the first time—I just watched from the counter while he sautéed the aromatics and blended everything down. He tasted it, adjusted the seasoning without asking, and ladled it carefully into bowls. That's when I realized it had stopped being just my recipe and became something he would carry forward.

The Alchemy of Vegetables

What makes this soup special isn't any single ingredient—it's the way ordinary vegetables transform when given time and heat. Cauliflower and broccoli are quiet, unassuming vegetables that most people have complicated feelings about, but blended into a creamy base, they become something people actually crave. The natural sugars in the carrots, the mild sweetness of caramelized onions, and the earthiness of the celery create a complexity that feels intentional and warm.

Croutons as the Soul of Soup

I learned early on that croutons aren't optional—they're the reason people remember the meal. Those golden, crispy pieces cut through the creaminess and give your teeth something to do, something to anticipate with each spoonful. A smooth soup without texture is fine, but a smooth soup with croutons is the difference between eating lunch and having an experience.

Variations and Personal Touches

This soup is generous enough to accept your improvisation. Some days I add a pinch of nutmeg for unexpected warmth, other times a splash of cream makes it feel indulgent. You can add white wine if you're feeling ambitious, or a handful of spinach if you want to sneak in more green. The thyme and oregano are steady anchors that keep it from falling apart no matter what you do.

  • A pinch of nutmeg adds an almost imperceptible warmth that makes people say the soup tastes familiar without knowing why.
  • Swap in roasted garlic instead of raw for a sweeter, mellower flavor that some prefer.
  • Fresh herbs scattered on top just before serving brighten everything and make it feel intentional.
Product image
Track cooking times accurately for baking, boiling, roasting, and multitasking recipes without overcooking.
Check price on Amazon
A bowl of blended Cauliflower and Broccoli Soup garnished with crunchy croutons and fresh herbs. Save to Pinterest
A bowl of blended Cauliflower and Broccoli Soup garnished with crunchy croutons and fresh herbs. | frostkettle.com

This soup has become my answer to almost any question on a cold day—are you feeling okay, do you need comfort, is something wrong. It's the kind of thing that costs almost nothing to make and somehow feels like everything.

Recipe Questions & Answers

Can I make this soup ahead of time?

Absolutely. This soup keeps well in the refrigerator for up to 4 days. Store croutons separately to maintain their crunch. Reheat gently on the stove, adding a splash of liquid if needed.

Is this soup freezer-friendly?

Yes, the soup freezes beautifully for up to 3 months. Cool completely before transferring to freezer-safe containers. Thaw overnight in the refrigerator and reheat slowly. Croutons are best made fresh.

How do I get the smoothest texture?

An immersion blender works well, but for the silkiest results, use a high-speed stand blender. Blend in batches, filling only halfway, and hold the lid securely with a towel to prevent steam escape.

What other vegetables can I add?

Potatoes add extra creaminess, while zucchini or spinach boost nutrition. A small piece of peeled potato blended with other vegetables creates an exceptionally velvety texture without adding cream.

Can I make this without dairy?

Completely. Use unsweetened almond, oat, or coconut milk instead of dairy milk. Omit cheese or use a vegan alternative. The soup remains creamy and satisfying without any animal products.

Why do my croutons get soggy quickly?

Stale, day-old bread actually produces crispier croutons. Ensure your oven is fully preheated, don't overcrowd the baking sheet, and let them cool completely before storing in an airtight container.

Creamy Cauliflower and Broccoli Soup

Rich, velvety soup blending cauliflower and broccoli with herbs, topped with golden croutons for a satisfying bowl.

Prep Duration
15 minutes
Time to Cook
30 minutes
Overall Time
45 minutes
Created by Nora Whitman


Skill Level Easy

Cuisine International

Makes 4 Serving Size

Dietary Information Meatless

What You Need

Vegetables

01 1 medium head cauliflower, cut into florets
02 1 medium head broccoli, cut into florets
03 1 medium onion, diced
04 2 celery stalks, diced
05 2 medium carrots, diced
06 2 garlic cloves, minced

Liquids

01 4 cups vegetable broth
02 1 cup milk or unsweetened plant-based milk

Spices and Seasoning

01 2 tablespoons olive oil
02 1 teaspoon dried thyme
03 1/2 teaspoon dried oregano
04 Salt and freshly ground black pepper to taste

Croutons

01 2 cups cubed crusty bread
02 2 tablespoons olive oil
03 1/2 teaspoon garlic powder
04 Pinch of salt

Optional Toppings

01 2 tablespoons chopped fresh parsley
02 Grated Parmesan or vegetarian hard cheese

How-To Steps

Step 01

Prepare Croutons: Preheat oven to 375°F. Toss bread cubes with olive oil, garlic powder, and salt. Spread on a baking sheet and bake for 10 to 12 minutes until golden and crisp. Set aside.

Step 02

Sauté Aromatics: In a large pot, heat olive oil over medium heat. Add onion, celery, and carrots; sauté for 5 minutes until softened.

Step 03

Infuse with Herbs: Add garlic, thyme, and oregano; cook for 1 minute until fragrant.

Step 04

Add Cruciferous Vegetables: Stir in cauliflower and broccoli florets, cook for 2 to 3 minutes.

Step 05

Simmer Soup Base: Pour in vegetable broth; bring to a boil, then reduce heat and simmer covered for 15 to 20 minutes until vegetables are tender.

Step 06

Blend to Creamy Consistency: Remove from heat. Use an immersion blender to blend soup until smooth and creamy, or blend in batches using a stand blender.

Step 07

Finish and Season: Stir in milk, season with salt and pepper. Gently reheat if needed.

Step 08

Plate and Serve: Ladle soup into bowls, top with croutons, parsley, and cheese if desired. Serve hot.

Tools You'll Need

  • Large soup pot
  • Knife and cutting board
  • Baking sheet
  • Immersion blender or stand blender
  • Wooden spoon

Allergy Info

Review every ingredient for allergens. Ask a healthcare professional if unsure.
  • Contains wheat from croutons
  • Contains milk if using dairy milk or cheese
  • For gluten-free preparation, use gluten-free bread for croutons
  • For dairy-free preparation, use plant-based milk and omit cheese
  • Always verify ingredient labels for potential hidden allergens

Nutrition Details (Each Serving)

Given for informational purposes, this isn't medical advice.
  • Energy Value: 240
  • Fats: 10 g
  • Carbohydrates: 30 g
  • Proteins: 8 g