🥬🧅 Slow Cooker 4-Ingredient Cabbage and Onion Soup
A Simple, Cozy & Budget-Friendly Soup With Tender Cabbage and Sweet Caramelized Onion Flavor
This Slow Cooker 4-Ingredient Cabbage and Onion Soup is proof that you don’t need a long ingredient list to make something warm, comforting, and delicious.
Tender cabbage and slowly cooked onions simmer together in a savory broth until everything becomes soft and flavorful. A little butter adds richness and helps round out the simple ingredients.
With just four basic ingredients, this soup is inexpensive, easy to prepare, and perfect for busy days when you want dinner waiting for you when you get home.
❤️ Why You’ll Love This Soup
Only 4 main ingredients
Slow cooker friendly
Minimal preparation
Budget-friendly
Naturally vegetarian
Comforting and warming
Low in calories
Easy to customize
Great for meal prep
Perfect for chilly days
📋 Recipe Information
Course: Soup, Main Course, Side Dish
Cuisine: American, Homestyle
Prep Time: 15 minutes
Cook Time: 6–8 hours
Total Time: 6 hours 15 minutes
Servings: 6
Difficulty: Easy
🛒 Ingredients
1 large head green cabbage, chopped
2 large yellow onions, thinly sliced
4 tablespoons butter
6 cups vegetable or chicken broth
Salt and black pepper, to taste
Note: The cabbage, onions, butter, and broth are the four core ingredients. Salt and pepper are simply seasoning.
🍳 Equipment Needed
Slow cooker
Cutting board
Sharp knife
Wooden spoon
Measuring cups
👩🍳 How to Make Slow Cooker Cabbage and Onion Soup
Step 1: Prepare the Vegetables
Remove the outer leaves from the cabbage.
Cut the cabbage into quarters and remove the tough core.
Chop the cabbage into bite-sized pieces.
Peel the onions and slice them thinly.
🧈 Step 2: Add Everything to the Slow Cooker
Place the chopped cabbage and sliced onions into the slow cooker.
Add the butter.
Pour the broth over the vegetables.
Season lightly with salt and black pepper.
The vegetables will look very full at first, but the cabbage will shrink considerably as it cooks.
🥄 Step 3: Stir
Give everything a gentle stir to distribute the butter and broth.
Don’t worry if the cabbage isn’t completely submerged.
As it cooks, the cabbage will soften and release additional moisture.
🕐 Step 4: Slow Cook
Cover the slow cooker.
Cook on:
LOW: 6–8 hours
or
HIGH: 3–4 hours
The soup is ready when the cabbage and onions are very tender.
For the deepest flavor, use the LOW setting.
✨ Step 5: Taste & Adjust
Remove the lid and stir the soup.
Taste the broth.
Add additional salt and black pepper as needed.
If you prefer a richer flavor, add another tablespoon of butter.
🍲 Step 6: Serve
Ladle the hot soup into bowls.
Serve as-is for a simple, light meal or pair it with crusty bread for a heartier dinner.
💡 My Best Tips for Delicious Cabbage Soup
Slice the Onions Thinly
Thinly sliced onions soften beautifully during the long cooking process and contribute a naturally sweet flavor.
Don’t Chop the Cabbage Too Small
Larger bite-sized pieces retain more texture and prevent the cabbage from becoming completely mushy.
Use a Flavorful Broth
Because there are so few ingredients, the broth makes a big difference.
A good-quality vegetable or chicken broth will give the soup considerably more flavor.
Cook It Low and Slow
The LOW setting allows the onions and cabbage to slowly soften and develop a deeper flavor.
🌟 Delicious Variations
Garlic Cabbage Soup
Add 2–3 cloves of minced garlic for extra savory flavor.
Creamy Cabbage Soup
Stir in ½ cup heavy cream during the final 15 minutes of cooking.
For an even richer version, blend a portion of the soup before adding the cream.
Sausage & Cabbage Soup
Brown sliced smoked sausage or cooked Italian sausage and add it during the final hour.
Bacon Cabbage Soup
Cook 4–6 slices of bacon until crisp.
Crumble over each serving and use a little of the bacon fat in place of some of the butter.
Carrot & Cabbage Soup
Add 2 sliced carrots for extra sweetness and color.
Potato & Cabbage Soup
Add 2–3 peeled and diced potatoes for a more substantial meal.
Spicy Cabbage Soup
Add:
Red pepper flakes
Smoked paprika
Cayenne pepper
Hot sauce
🍽️ What to Serve With It
This simple soup pairs wonderfully with:
Crusty sourdough
Garlic bread
Grilled cheese
Cornbread
Toasted baguette
Roasted chicken
Grilled sausage
Baked potatoes
Simple green salad
For a light meal, enjoy a bowl of soup with a slice of toasted bread.
🥡 Storage Instructions
Refrigerator
Allow the soup to cool before transferring it to airtight containers.
Refrigerate for up to 4 days.
Freezer
Freeze in individual portions for up to 3 months.
Leave some space at the top of each container because the liquid expands when frozen.
Thaw overnight in the refrigerator before reheating.
Reheating
Reheat gently on the stovetop over medium-low heat until steaming hot.
Individual servings can also be microwaved for approximately 2–3 minutes, stirring halfway through.
📊 Nutrition Information
Approximate per serving:
Calories: 170
Protein: 4g
Fat: 12g
Carbohydrates: 14g
Fiber: 4g
Net Carbs: 10g
Saturated Fat: 7g
Sodium: 500mg
Nutrition information is approximate and will vary depending on the broth and amount of butter used.
❓ Frequently Asked Questions
Can I use red cabbage?
Yes. Red cabbage works well, although it will give the soup a darker color and slightly different flavor.
Can I use chicken broth instead of vegetable broth?
Absolutely. Chicken broth creates a richer, more savory soup.
Do I need to sauté the onions first?
No. The slow cooker can handle everything in one step. However, sautéing the onions in butter first will give them a deeper caramelized flavor.
Can I make this soup vegan?
Yes. Use vegetable broth and replace the butter with olive oil or vegan butter.
Can I make it in an Instant Pot?
Yes. Use the sauté function to soften the onions first, then add the remaining ingredients and cook under high pressure for approximately 5 minutes, followed by a natural release.
Is cabbage soup good for meal prep?
Yes. It stores and reheats very well, making it a convenient make-ahead lunch or dinner.
Can I add meat?
Definitely. Sausage, shredded chicken, ground beef, bacon, or ham all pair beautifully with cabbage.
How can I make it more filling?
Add potatoes, beans, sausage, shredded chicken, or another protein source.
❤️ Final Thoughts
This Slow Cooker 4-Ingredient Cabbage and Onion Soup is simple comfort food at its best.
Tender cabbage, sweet slow-cooked onions, buttery richness, and savory broth come together with almost no effort. The slow cooker does the hard work while you go about your day.
It’s inexpensive, cozy, versatile, and perfect for making a large batch to enjoy throughout the week.