Easy Slow Cooker Green Bean Casserole with Crispy Onions
This creamy, savory slow cooker green bean casserole is completely hands-off, uses fresh or frozen green beans, and keeps the crispy onions crunchy until the very end. Perfect for Thanksgiving, potlucks, or a cozy weeknight dinner.
- Prep Time: 15 minutes
- Cook Time: 3-4 hours (HIGH) or 5-6 hours (LOW)
- Total Time: 3 hours 15 minutes to 6 hours 15 minutes
- Yield: 8 servings 1x
- Category: Side Dish
- Cuisine: American
Ingredients
Scale
- 1 ½ lbs fresh or frozen green beans (trimmed and cut into 2-inch pieces if fresh)
- 2 cans (10.5 oz each) cream of mushroom soup (e.g., Campbell’s)
- 1 cup whole milk (or 2% in a pinch; avoid skim)
- 1 tablespoon soy sauce
- ½ teaspoon black pepper (freshly ground)
- ½ teaspoon garlic powder
- ¼ teaspoon salt (plus more to taste)
- 1 ½ cups crispy fried onions (e.g., French’s; divided: 1 cup for inside, ½ cup for topping)
- Optional: ½ cup shredded cheddar cheese (added in last 30 minutes)
- Optional: ½ cup sliced mushrooms (sautéed first)
Instructions
- Prepare the green beans: If using fresh, rinse, trim stem ends, and cut into 2-inch pieces. If using frozen, measure out without thawing.
- Make the creamy sauce base: In a large mixing bowl, whisk together cream of mushroom soup, whole milk, soy sauce, black pepper, and garlic powder until smooth.
- Combine in the slow cooker: Place green beans in a 6-quart slow cooker. Pour sauce over the top. Add 1 cup of crispy fried onions. Gently stir to coat evenly.
- Cook low and slow: Cover and cook on LOW for 5-6 hours or on HIGH for 3-4 hours, until green beans are tender but not mushy. Stir gently about 30 minutes before the end.
- Add the crispy topping: Turn off slow cooker or switch to ‘Warm’. Sprinkle remaining ½ cup crispy fried onions evenly over the top. Do not stir.
- Let it rest (optional): Let casserole sit uncovered for 5 minutes to allow topping to settle and sauce to thicken slightly.
- Serve immediately: Spoon into serving dishes, ensuring each scoop has green beans, sauce, and crispy onions. Serve hot.
Notes
For best texture, avoid overcooking green beans. Soy sauce is a secret ingredient for umami depth—don’t skip it. If casserole is watery, cook uncovered on HIGH for 15-20 minutes. For potlucks, add crispy onions just before serving to keep them crunchy. Leftovers can be stored in the fridge for up to 4 days; reheat in oven at 350°F for 15-20 minutes.
Nutrition
- Serving Size: 1 cup
- Calories: 210
- Sugar: 5
- Sodium: 680
- Fat: 12
- Saturated Fat: 4
- Carbohydrates: 22
- Fiber: 3
- Protein: 5
Keywords: green bean casserole, slow cooker, crockpot, Thanksgiving side dish, easy, creamy, crispy onions, comfort food