Minestrone is one of those soups that tastes like it simmered all afternoon, even when you only spent about 20 minutes on it. This easy slow cooker minestrone is packed with vegetables, white beans, and small pasta in a tomato-herb broth. You prep the ingredients, set the slow cooker, and come back to a warm, hearty dinner.
It works well on busy weeknights, cold days, or any time you want a comforting meal with leftovers for lunch.
Why You’ll Love This Slow Cooker Minestrone
- Minimal hands-on time: Most of the work is chopping vegetables and measuring.
- Simple pantry ingredients: Canned tomatoes, beans, and broth do most of the flavor work.
- Easy to customize: Swap vegetables or beans based on what you have.
- Freezes well: Makes a good batch for future meals when stored without the pasta.
Ingredients
- 1 tbsp (15 ml) olive oil, optional
- 1 small yellow onion, diced (about 1 cup / 150 g)
- 2 medium carrots, diced (about 1 cup / 130 g)
- 2 celery stalks, diced (about 1 cup / 100 g)
- 3 cloves garlic, minced
- 1 can (14.5 oz / 411 g) diced tomatoes, undrained
- 6 cups (1.4 L) low-sodium vegetable broth
- 1 can (15 oz / 425 g) cannellini beans, drained and rinsed
- 1 small zucchini, diced (about 1 cup / 120 g)
- 2 cups (60 g) baby spinach
- 1 cup (90 g) small pasta, such as ditalini or elbow macaroni
- 1 tsp (2 g) dried Italian seasoning
- 1 bay leaf
- Salt and black pepper, to taste
- Grated Parmesan cheese, for serving
Ingredient Notes
Diced tomatoes provide the base of the broth, so use a brand you like. Cannellini beans add creaminess without making the soup heavy. Add the pasta at the end so it does not turn mushy. Low-sodium broth lets you control the saltiness, and you can always add more salt at the end.
Equipment You’ll Need
- A 6-quart (5.7 L) or larger slow cooker
- Cutting board and sharp knife
- Can opener
- Ladle and soup bowls
How to Make Slow Cooker Minestrone
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Heat the olive oil in a skillet over medium heat, if using. Add the onion, carrots, and celery and cook for about 5 minutes, until the onion looks soft and translucent. This step adds depth but is optional if you are short on time.
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Transfer the cooked vegetables to the slow cooker. Add the garlic, diced tomatoes, vegetable broth, cannellini beans, Italian seasoning, and bay leaf. Stir to combine.
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Cover and cook on low for 6 to 8 hours, or on high for 3 to 4 hours. These are estimated times and may vary by slow cooker. The vegetables should be tender when pierced with a fork.
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Stir in the zucchini during the last 30 to 60 minutes of cooking so it stays tender but not mushy.
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Turn the slow cooker to high. Add the pasta and cook uncovered or partly covered for 20 to 30 minutes, stirring once or twice, until the pasta is tender. Check the package directions for cooking time, since slow cookers vary.
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Stir in the spinach until wilted, about 1 to 2 minutes. Remove the bay leaf and season with salt and black pepper to taste.
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Ladle into bowls and top with grated Parmesan. Serve warm.
Pro Tips for the Best Results
- Cook the vegetables in a skillet first if you want more savory, rounded flavor.
- Add zucchini late so it keeps its texture.
- Wait to add pasta until the end, because it keeps absorbing liquid as the soup sits.
- Taste before adding salt, since broth and canned tomatoes contain different amounts of sodium.
- If the soup gets too thick, stir in extra broth or water.
Common Mistakes to Avoid
The most common problem is overcooked pasta. Add it near the end of cooking, and check it before serving. Another issue is bland soup, which usually needs more salt, a squeeze of lemon, or a little more Parmesan. Finally, do not add spinach too early, or it will turn dull and stringy.
Variations and Substitutions
- Protein: Add cooked sausage or shredded chicken.
- Beans: Use kidney beans or chickpeas instead of cannellini beans.
- Vegetables: Add diced potatoes, green beans, or chopped kale.
- Gluten-free: Use gluten-free pasta and cook it separately to keep it from breaking down.
Serving Suggestions
Serve minestrone with crusty bread, garlic toast, or a simple green salad. A drizzle of olive oil and a sprinkle of Parmesan add richness and flavor.
Storage and Reheating
Let the soup cool, then store it in an airtight container in the refrigerator for up to 3 to 4 days. For freezing, leave out the pasta and freeze the soup for up to 3 months. Reheat it gently on the stove over medium heat, adding pasta separately if needed, and add a splash of broth if the soup has thickened.
Frequently Asked Questions
Can I cook minestrone in the slow cooker without browning the vegetables?
Yes. Browning the vegetables first adds flavor, but you can skip that step and add everything directly to the slow cooker.
Can I make this soup ahead of time?
Yes. Make it up to 2 days ahead and refrigerate it, then add fresh pasta and spinach when reheating.
Can I freeze slow cooker minestrone?
Yes, but leave out the pasta before freezing. Cook fresh pasta when you reheat the soup.
Why is my minestrone too thick?
Pasta and beans absorb liquid as the soup sits. Stir in a little broth or water when reheating.
What can I use instead of pasta?
Try cooked rice, farro, or small potatoes for a different texture.
Slow Cooker Minestrone Recipe Card
Recipe Name: Easy Slow Cooker Minestrone
Short Description: A hearty vegetable soup with beans, tomatoes, and small pasta, made in the slow cooker.
Prep Time: 20 minutes
Cook Time: 6 to 8 hours on low, or 3 to 4 hours on high, plus 20 to 30 minutes for pasta (estimated)
Total Time: About 7 to 9 hours (estimated)
Servings: 6 to 8
Course: Soup, Dinner
Cuisine: Italian-American
Cooking Method: Slow cooker
Notes: Add pasta at the end and zucchini during the last hour. Adjust salt and broth to taste.
Storage: Refrigerate up to 3 to 4 days. Freeze without pasta for up to 3 months.
Nutrition: Nutrition information is an estimate and may vary depending on the ingredients and brands used.
What is your favorite soup to make in the slow cooker? Share it in the comments below.
