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–+ servings

Slow Cooker 3-Ingredient Onion and Potato Soup

This humble slow cooker soup is the definition of comfort—just onions, potatoes, and broth slowly transforming into something rich, cozy, and deeply satisfying. It’s simple, budget-friendly, and tastes like it’s been passed down for generations.
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Prep Time 15 minutes
Cook Time 8 hours
Total Time 8 hours 15 minutes
Course Dinner, Slow Cooker, Soup
Cuisine American, Comfort Food
Servings 6 servings
Calories 124 kcal

Ingredients
  

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

Instructions
 

  • Place sliced onions evenly in the bottom of the slow cooker.
  • Add chopped potatoes on top of the onions.
  • Pour broth over everything and gently press down so ingredients are mostly submerged.
  • Cover and cook on LOW for 8–10 hours or HIGH for 4–5 hours.
  • Stir gently, allowing some potatoes to break apart and thicken the soup.
  • Optional: mash a portion of the potatoes for a thicker, creamier texture.
  • Season with salt and pepper if needed, then serve warm.

Notes

For extra richness, add a pat of butter or a splash of cream before serving. Best enjoyed with thick, crusty bread for dipping.

Nutrition

Serving: 1servingsCalories: 124kcalCarbohydrates: 23.8gProtein: 4.2gFat: 0.6gSaturated Fat: 0.2gSodium: 300mgFiber: 2.4gSugar: 3.2g
Keyword 3 ingredient soup, budget friendly meals, easy crockpot soup, onion potato soup, slow cooker potato soup