Creamy Zucchini Yellow Squash Soup
A silky, herbaceous summer squash soup balancing zucchini and yellow squash with fresh rosemary, garlic, and Italian herbs. The vegetable base sweetens as it cooks, creating natural creaminess without dairy. Serve hot or chilled in warm months as a light lunch, starter, or side. This version suits multiple cooking methods—stovetop, pressure cooker, or electric pressure cooker—making it adaptable to your kitchen.
Ingredients
- 2 T olive oil
- 1 T butter
- 1 yellow onion, chopped
- 1 T garlic, minced fresh
- 1 tsp Italian Herb Blend1 tsp dried oregano + 1/2 tsp dried thyme1.5 tsp totalif unavailable
no flavor shift
- 4 tsp fresh rosemary, chopped, or frozendried rosemary1 tsp dried (equivalent to 4 tsp fresh)convenience
more concentrated flavor
Full guide → - 8 cups zucchini and yellow summer squash, diced
- 6 cups vegetable or chicken stock
- salt, to taste
- black pepper, fresh-ground, to taste
- Parmesan cheese, fresh grated, for serving(optional)nutritional yeast or cashew cream2T nutritional yeast or 1/4 cup soaked cashews blended with watervegan
umami/creamy
Full guide →
Instructions
- 1
Chop onion, mince garlic, and finely chop fresh rosemary.
- 2
Heat olive oil and butter in a large heavy soup pot or pressure cooker.
- 3
Add onion and saute until translucent and softened, about 5 minutes.
- 4
Add garlic, rosemary, and Italian Herb Blend; cook 3-5 minutes more.
- 5
Chop zucchini and yellow squash into 8 cups total.
- 6
Add vegetable or chicken stock to the onion mixture and simmer 10 minutes.
- 7
Add chopped squash.
- 8
For stovetop: simmer on very low heat 30 minutes until squash is very soft. For pressure cooker: lock lid, select HIGH PRESSURE MANUAL for 5 minutes, then quick-release.
- 9
Puree the mixture with an immersion blender, or work in batches using a food processor or blender.
- 10
Simmer until desired thickness is reached, about 20 minutes.
- 11
Season to taste with salt and black pepper.
- 12
Serve hot, topped with Parmesan cheese if desired.
Tips
Prepare all vegetables before cooking—onion, garlic, and rosemary soften first to build flavor base, preventing raw garlic taste.
Use immersion blender for smooth texture and safety; if using food processor or blender with hot liquid, fill only halfway to avoid splattering.
Simmer duration varies by desired thickness—start checking at 15 minutes and adjust heat as needed.
Good to Know
Refrigerate in airtight container up to 4 days. Freeze up to 3 months in freezer-safe containers, leaving 1 inch headspace for expansion.
Prepare soup through pureeing step, cool, and refrigerate. Reheat gently on stovetop with splash of stock if needed. Or freeze after pureeing.
Serve hot or chilled in warm weather. Garnish with fresh Parmesan, croutons, fresh rosemary sprigs, or drizzle of good olive oil. Pair with crusty bread or grilled cheese sandwich.
Common Mistakes
Overfill blender or food processor with hot liquid to avoid splattering—fill only halfway and cover with towel.
Skip the 10-minute stock simmer before adding squash—this develops flavor depth and prevents watery soup.
Cook squash too long on high heat—medium-low heat releases natural sweetness without reducing too fast.
Substitutions
Dairy-Free Swaps
Vegan Options
umami/creamy
Full guide →General Alternatives
no flavor shift
more concentrated flavor
Full guide →FAQ
Can I make this soup dairy-free?
Yes. Replace butter with olive oil or coconut oil (1:1 ratio) and skip Parmesan or top with nutritional yeast, cashew cream, or tahini for creaminess.
Can I freeze this soup?
Yes. Cool completely, transfer to freezer-safe containers leaving 1 inch headspace, and freeze up to 3 months. Thaw overnight in refrigerator and reheat gently on stovetop with additional stock if needed.
How do I adjust consistency after pureeing?
If too thick, add vegetable or chicken stock gradually while simmering. If too thin, continue simmering uncovered on medium-low heat until reduced to desired consistency, stirring occasionally.