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A plate of green bean casserole topped with crispy fried onions, with a spoon on the side. A small bowl with more casserole sits nearby on a light gray cloth.

Homemade Green Bean Casserole in the Slow Cooker with Fresh Green Beans

This slow cooker green bean casserole gives you everything you want in the classic without tying up the oven or relying on canned soup. Fresh green beans stay tender but not mushy, while a homemade mushroom sauce keeps it rich and creamy. The best part? A buttery, crispy onion and panko topping that you add right at the end, so it stays crunchy instead of soggy. It’s the kind of side dish makes dinner a whole lot easier.
Course: Side Dish
Cuisine: American
Servings: 6
Prep Time: 20 minutes
Cook Time: 4 hours
Total Time: 4 hours 20 minutes

Ingredients
 

  • 8 ounces mushrooms
  • 3 tablespoons butter
  • 3 tablespoon flour
  • 1 cup chicken broth
  • 1 cup whole milk
  • 2 teaspoons Worcestershire sauce
  • Salt and pepper to taste
  • 3 cups canned fried onions (divided)
  • 1 lb fresh green beans
  • 3 tablespoons butter
  • ½ cup panko

Instructions
 

  • Melt 3 tablespoons of butter over medium heat in a large skillet and add chopped or sliced mushrooms. Cook until tender and the liquid has been released, about 6-8 minutes.
  • Add the flour and whisk to combine. Let it cook for a minute then slowly add the chicken broth, milk and Worcestershire sauce, whisking constantly until it thickens, about 3-4 minutes. Salt and pepper to taste.
  • Mix 1 cup of crushed fried onions to the soup mixture and pour over green beans in a slow cooker. Stir to combine.
  • Cover and cook on low for 4-5 hours or until the beans are tender but not mushy. Or cook on high for 2-3 hours.
    • Test about ½ way through as some beans may cook faster than others.
  • Before serving, melt butter in a skillet over medium-high and add panko and 2 cups of fried onions. Cook until golden brown, 2-3 minutes. Sprinkle over green bean casserole to serve.
Barbara's Notes + Tips
  • The fresher the beans, the more flavor you'll have.
  • Add the crispy topping to each serving so that it doesn't get soft if you have left overs. 

Nutrition

Calories: 369kcal | Carbohydrates: 27g | Protein: 5g | Fat: 27g | Saturated Fat: 14g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 3g | Trans Fat: 0.5g | Cholesterol: 36mg | Sodium: 553mg | Potassium: 381mg | Fiber: 3g | Sugar: 6g | Vitamin A: 940IU | Vitamin C: 10mg | Calcium: 96mg | Iron: 2mg
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