Slow Cooker Onion and Potato Soup

This Slow Cooker 3-Ingredient Onion and Potato Soup is a classic budget-friendly comfort food recipe inspired by simple meals from the Great Depression era. Made with sweet onions, hearty potatoes, and rich beef broth, this slow cooker soup becomes incredibly flavorful as it cooks low and slow.

As the soup simmers in the crockpot, the onions slowly caramelize, the potatoes become soft and creamy, and the broth develops a deep, savory flavor that tastes like it took hours of complicated cooking. The best part? This easy slow cooker soup recipe uses only three simple ingredients, making it perfect for busy weeknights or when you want a warm, satisfying homemade meal with minimal effort.

Serve this hearty potato soup with crusty bread, buttered toast, or a simple green salad for a cozy dinner that fills you up and warms you from the inside out.

Ingredients

• 3 large yellow onions, thinly sliced
• 4 large russet potatoes, peeled and cut into chunks
• 6 cups beef broth

Directions

1. Prepare the onions
   Peel the onions and slice them thinly from root to tip. Thin slices allow them to soften and slowly caramelize in the slow cooker, creating a naturally sweet flavor.
2. Cut the potatoes
   Peel the russet potatoes and cut them into hearty chunks about 1 to 1½ inches in size. This helps them stay tender without falling apart too quickly.
3. Layer in the slow cooker
   Spread the sliced onions evenly across the bottom of the slow cooker to create a flavorful base.
4. Add the potatoes
   Place the potato chunks on top of the onions in an even layer so they cook evenly.
5. Pour in the broth
   Add the beef broth, ensuring most of the vegetables are covered with liquid.
6. Slow cook
   Cover and cook:
   • LOW for 8–10 hours, or
   • HIGH for 4–5 hours

   Cook until the onions are soft and golden and the potatoes are tender.

7. Stir and serve
   Gently stir the soup before serving. Some potatoes will naturally break down, giving the broth a thick, creamy texture.

Ladle the hot soup into bowls and serve warm.

Benefits of This Recipe

Budget-Friendly Meal Made with only three affordable ingredients.
Easy Slow Cooker Recipe Perfect for busy days with minimal prep.
Hearty and Filling Potatoes provide satisfying comfort and energy.
Great for Meal Prep Leftovers taste even better the next day.
Naturally Simple Ingredients No complicated ingredients or cooking techniques.

Variations & Tips

• Make it vegetarian: Replace beef broth with vegetable broth.
• Add more flavor: Sprinkle black pepper or fresh herbs before serving.
• Creamier texture: Lightly mash some of the potatoes in the soup.
• Use chicken broth: Creates a lighter but still delicious flavor.
• Store leftovers: Refrigerate for up to 3 days and reheat gently.