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Slow Cooker Amish Green Bean Casserole

When holiday meals need to be simplified without sacrificing flavor, this slow cooker Amish green bean casserole is a must-try comfort food. The rich combination of tender green beans, earthy mushrooms, tangy sour cream, and crispy fried onions creates a dish that feels like a warm hug on a cold day. Plus, it’s easily customizable to suit your family’s taste.
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Prep Time 15 minutes
Cook Time 4 hours
Total Time 4 hours 15 minutes
Servings: 4 servings
Course: Side Dish
Cuisine: American
Calories: 485
Ingredients Equipment Method Notes

Ingredients
  

Vegetables & Base
  • 4 cups fresh green beans trimmed and cut (or 2 cans, drained)
  • 1 medium onion finely chopped
  • 1 cup sliced mushrooms optional
Casserole Mixture
  • 2 cans cream of mushroom soup 10.5 oz each
  • 1 cup sour cream
  • 1/2 cup milk
  • 1 teaspoon garlic powder
  • 1/2 teaspoon black pepper
  • 1/2 teaspoon salt
Toppings
  • 1 cup shredded cheddar or Colby Jack cheese use half for folding into the sauce and reserve half for topping if preferred
  • 1 cup crispy fried onions half for mixing into the casserole, half for topping

Equipment

  • Slow cooker
  • Large bowl
  • Whisk
  • Cutting board

Method
 

  1. Lightly grease your slow cooker with nonstick spray or butter to prevent sticking and ease cleanup.
  2. In a large bowl, whisk together the 2 cans of cream of mushroom soup, 1 cup sour cream, 1/2 cup milk, 1 teaspoon garlic powder, 1/2 teaspoon salt, and 1/2 teaspoon black pepper.
  3. Fold in the finely chopped onion, 1 cup sliced mushrooms (if using), 1/2 cup of the shredded cheese, and half of the crispy fried onions into the sauce.
  4. Place the green beans into the slow cooker and pour the creamy sauce mixture over them, stirring gently to coat evenly.
  5. Cover and cook on LOW for 4-5 hours (or on HIGH for 2-3 hours) until the green beans reach your desired tenderness.
  6. If desired, sprinkle the remaining shredded cheese and crispy fried onions on top during the last few minutes of cooking for an extra crispy finish.

Notes

This slow cooker casserole is a perfect make-ahead dish for busy holidays or weeknights. You can easily customize the recipe by substituting the cream of mushroom soup with cream of celery or chicken soup, or even try dairy-free alternatives. The dish stands out by combining classic comfort food elements and offers versatility with toppings such as bacon bits or homemade crispy onions. Leftovers can be stored in the refrigerator and reheated for another comforting meal.