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Slow cooker minestrone soup

By Ami · September 7, 2026 · ★★★★★ 4.8 from 104 reviews · Jump to Recipe · Print

Slow cooker minestrone soup is the healthy recipe I make on a Sunday when I want the whole week handled — a rich tomato broth absolutely loaded with beans and vegetables, with small pasta stirred in at the end. It's a dump-and-go, it's naturally vegetarian, and at 14g of fiber a bowl it does the fibermaxxing thing without anyone having to say the word.

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This is the most fiber you'll get into a bowl without trying.

• Two cans of beans and six vegetables. Kidney beans, cannellini, carrots, celery, zucchini, green beans, tomatoes and spinach add up to 14g of fiber and a genuinely full bowl for very little money.
• Everything goes in raw. No browning, no sautéing, no extra pan. Chop, tip it all in, switch it on. The only thing that happens later is the pasta and spinach.
• It's better as leftovers than most soups are fresh. The broth deepens for days and it freezes without complaint, so a Sunday pot covers lunches all week — the same reason slow cooker beef stew earns its place.

Here's what you'll need.

A parmesan rind dropped in with the broth is the single best thing you can do to this soup — it melts slowly and gives the whole pot a savory depth that vegetable broth alone can't reach. Small pasta shapes (ditalini, small shells, elbows) work best; anything long tangles. Use fire-roasted diced tomatoes if you can find them.

Here's how it all comes together.

Step 1 — Fill the slow cooker

Add the onion, carrots, celery, garlic, zucchini, green beans, both cans of beans, the diced tomatoes, tomato paste, broth, Italian seasoning, bay leaves and the parmesan rind. Stir once and cook on low for 7 to 8 hours or high for 4.

Step 2 — Cook the pasta in at the end

Stir in the small pasta and cook on high for 20 to 25 minutes, until just tender. Adding it now rather than in the morning is what stops it from turning to mush and drinking the entire broth.

Step 3 — Finish with spinach and parmesan

Fish out the bay leaves and what's left of the parmesan rind, stir in the spinach until it wilts, and taste for salt — it will need more than you expect. Finish each bowl with grated parmesan and good olive oil.

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Things I learned while testing this recipe.

• The parmesan rind is not optional. Freeze your rinds as you finish blocks of parmesan. One rind turns a decent vegetable soup into one people ask about.
• Pasta in the last 25 minutes only. Add it at the start and you'll come home to a pot of tomato-flavored porridge. This is the single most common minestrone mistake.
• Tomato paste, not just canned tomatoes. Two tablespoons adds the concentrated depth that keeps the broth from tasting thin and watery after eight hours.
• Salt hard at the end. Beans and vegetables absorb an enormous amount of salt over a long cook. Season generously once everything is in, not at the start.

Make it ahead, or make it your own.

• Freeze it without the pasta. The base freezes for 3 months. Cook fresh pasta when you reheat and it tastes brand new instead of bloated.
• Add protein. Stir in shredded rotisserie chicken or browned Italian sausage at the end for about 25g of protein a bowl. A can of chickpeas keeps it vegetarian and pushes the fiber higher still.
• Gluten free. Use gluten-free small pasta, cooked separately and added to each bowl — GF pasta breaks down fast in a hot pot.

Here's what I'd serve with this.

• Crusty bread and good olive oil for dipping.
• A wedge of parmesan and a grater on the table so people can go heavy.
• Mediterranean chickpea salad for a fiber-forward lunch pairing.
• Baked ziti if you're feeding a crowd and want something substantial beside it.
• Greek yogurt banana bread for something sweet at the end.

Just in case you have leftovers.

Storing: refrigerate up to 5 days in an airtight container — one of the longest-keeping soups there is, thanks to the acidity of the tomatoes. Freeze the base (without pasta) for up to 3 months in portions.

Reheating: warm on the stove over medium for about 8 minutes or microwave a bowl for 2 to 3 minutes, adding a splash of broth since the pasta keeps drinking liquid. If the pasta has gone soft, a fresh handful cooked separately fixes it entirely.

More healthy recipes...

Slow cooker beef stew — fall-apart beef, zero effort

Chicken tortilla soup — smoky, 30 minutes, 34g protein

Creamy tomato basil soup — the grown-up version of the can

Mediterranean chickpea salad — 10 minutes, no cooking, huge fiber

If cozy one-pot dinners are your whole personality, this cookbook is for you.

The Ultimate Slow Cooker Mediterranean Diet Cookbook is built around this kind of cooking — a handful of honest ingredients, one pot, long slow flavor and almost no active work. Comfort-food dinners that happen to be good for you.

Get the cookbook on Amazon

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FAQ

Why did my minestrone pasta turn to mush?

It was added too early. Pasta needs only the last 20 to 25 minutes on high. If you're making the soup ahead or freezing it, cook the pasta separately and add it per bowl.

Can I freeze minestrone soup?

Yes, for up to 3 months — but freeze the base without the pasta, which goes bloated and soft. Cook a fresh handful when you reheat.

How much fiber is in minestrone soup?

About 14g per bowl in this version, from two cans of beans plus carrots, celery, zucchini, green beans, tomatoes and spinach. Adding a can of chickpeas pushes it higher still.

Can I add meat to slow cooker minestrone?

Yes. Stir shredded rotisserie chicken or browned Italian sausage in at the end, which brings it to roughly 25g of protein a bowl. Adding raw meat at the start also works but muddies the clean vegetable flavor.