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Slow Cooker Green Bean Casserole

This Slow Cooker Green Bean Casserole is the easiest way to prepare a classic Thanksgiving side dish this holiday! Creamy mushroom soup mixes with canned green beans and cooked to perfection. Topped with crispy French fried onions, it has all the flavor you love with a fraction of the prep time required.
Prep Time5 minutes
Cook Time2 hours
Total Time2 hours 5 minutes
Course: Side Dish
Cuisine: American
Keyword: mushroom and onion green bean casserole, slow cooker green bean casserole
Servings: 4 servings
Calories: 465kcal
Author: Kasey Schwartz


  • slow cooker
  • measuring spoons
  • Liquid measuring cup
  • bowl
  • Mixing spoon or spatula


  • 2 (10.5-ounce) cans cream of mushroom soup
  • cup whole milk
  • ½ teaspoon salt
  • ½ teaspoon black pepper
  • 3 (14.5-ounce) cans cut green beans
  • 1 (6-ounce) can French fried onions
  • Nonstick cooking spray


  • Have your slow cooker ready.
  • To a medium mixing bowl, add the cans of cream of mushroom soup, milk, salt, and pepper. Mix well to combine.
    2 (10.5-ounce) cans cream of mushroom soup, ⅓ cup whole milk, ½ teaspoon salt, ½ teaspoon black pepper
  • Add in the green beans and fold to combine, then stir in ½ cup of the French fried onions.
    3 (14.5-ounce) cans cut green beans, 1 (6-ounce) can French fried onions
  • Spray the slow cooker with nonstick cooking spray. Spread out the green beans in an even layer across the bottom of the slow cooker. Place the lid on the slow cooker and cook on low for 2-3 hours, or on high for 1 hour, until the green beans are tender and saucy.
    Nonstick cooking spray
  • Remove the lid and sprinkle the top of the casserole with the remaining french fried onions. Serve hot or warm.


  • This recipe is easily doubled or tripled.
  • You can serve it straight from the slow cooker or transfer the casserole to a serving dish to place on the table.
  • You can also make this recipe with frozen green beans. You’ll need about 2 pounds of frozen green beans in place of the canned green beans.


Serving: 1serving | Calories: 465kcal | Carbohydrates: 48g | Protein: 13g | Fat: 26g | Saturated Fat: 11g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 2g | Cholesterol: 10mg | Sodium: 1726mg | Potassium: 872mg | Fiber: 9g | Sugar: 11g | Vitamin A: 2162IU | Vitamin C: 38mg | Calcium: 146mg | Iron: 4mg