Creamy Carrot Broccoli Soup with Roasted Vegetables
A velvety vegetable soup built on a foundation of sautéed carrots, broccoli, and cauliflower, enriched with butter and thickened with flour. This version delivers deep vegetable flavor without cream, relying instead on natural starches and a smooth blended texture for richness. Bright notes of red pepper flakes and dried basil add warmth and herbaceous complexity, while low-sodium chicken broth keeps the focus on the vegetables themselves. The soup suits weeknight dinners and meal prep equally well, coming together in under 30 minutes. Ideal for those seeking comfort food that's naturally lighter, this recipe proves that creamy texture doesn't require dairy—just proper technique and patient cooking. Serve as a satisfying lunch, dinner starter, or pair with crusty bread for a complete meal.
Ingredients
- ½ yellow onion, peeled and diced
- 2 cloves garlic, peeled and minced
- 3 tablespoons unsalted butter
- 2 cups chopped cauliflower
- 4 cups broccoli florets
- 1 large carrot, peeled and diced
- 3 tablespoons all-purpose flourcornstarchuse 2 tablespoonsgluten-free
removes:gluten
- 1 teaspoon red pepper flakescayenne pepperuse 1/4 teaspoon, adjust to tastespicier heatFull guide →
- 1 teaspoon dried basilfresh basiluse double amount, add after blendingstronger flavorFull guide →
- 6 cups low-sodium fat-free chicken brothvegetable brothequal amountvegetarianFull guide →
- 1 teaspoon salt
- ½ teaspoon freshly ground black pepper
Instructions
- 1
Heat butter in a deep heavy-bottomed pan over medium heat.
- 2
Add onion, broccoli, garlic, cauliflower, and carrot. Season with salt and pepper and cook, stirring occasionally, until vegetables are softened, about 5 minutes.
- 3
Mix in flour and dried basil. Continue cooking and stirring for 1 minute.
- 4
Pour in broth and bring the mixture to a boil. Cover, reduce heat to low, and simmer for 15 minutes.
- 5
Carefully transfer cooked soup to a blender and blend until smooth.
- 6
Ladle into bowls and serve hot.
Tips
Toast the flour in the butter for a full minute to cook out the raw flour taste and create a richer, deeper flavor base. This step prevents a starchy, chalky finish and adds subtle toasted notes.
Blend in batches if your blender is small, filling it only halfway each time to avoid overflow. Hot liquid expands; work carefully and remove the blender center cap once steam builds.
For extra creaminess without dairy, reserve one cup of the cooked broccoli before blending, then stir it back into the smooth base for textural contrast and added body.
Good to Know
Refrigerate in airtight containers up to 5 days. Freeze up to 3 months in freezer-safe containers, leaving 1 inch headspace.
Prepare and chop all vegetables up to 2 days ahead. Store in separate containers. Make soup up to 2 days ahead and reheat gently on low heat, adding broth if needed.
Ladle into bowls and serve hot. Pair with crusty bread, grilled cheese sandwich, or a side salad. Garnish with croutons, fresh herbs, or a drizzle of olive oil.
Common Mistakes
Don't skip the 1-minute flour cook to avoid raw, starchy flavor in the finished soup.
Don't blend hot soup without venting to avoid splattering or pot pressure buildup.
Don't oversimmer after blending to avoid vegetable flavor breakdown and color loss.
Substitutions
Vegan Options
Gluten-Free Swaps
General Alternatives
FAQ
Can I make this soup dairy-free?
Yes. Replace butter with an equal amount of olive oil or coconut oil. The soup will still achieve creaminess through the blended vegetables and starch from flour. Taste and adjust seasoning since oil behaves differently than butter.
What if I don't have a blender?
Use an immersion blender directly in the pot, working in batches if needed. For chunkier texture, use a potato masher. A food processor works but may leave slightly larger pieces. Results will be less uniform but still delicious.
Can I freeze this soup?
Yes. Cool completely, then freeze in airtight containers or freezer bags up to 3 months. Thaw overnight in the fridge or reheat from frozen on low heat, stirring often. Add a splash of broth or water as it thaws, since consistency may thicken.