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Quick Slow Cooker Green Bean Casserole from Scratch

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A rich, savory green bean casserole made from scratch in the slow cooker. No canned soup needed—just fresh ingredients and 15 minutes of prep for a creamy, crowd-pleasing side dish that works for weeknights and holidays alike.

Ingredients

Scale
  • 1 ½ pounds fresh green beans, trimmed and halved
  • 8 ounces cremini mushrooms, sliced
  • 1 medium yellow onion, diced
  • 3 cloves garlic, minced
  • 2 tablespoons unsalted butter
  • 2 tablespoons all-purpose flour
  • 1 cup low-sodium chicken or vegetable broth
  • 1 cup heavy cream
  • 1 teaspoon salt
  • ½ teaspoon black pepper
  • ¼ teaspoon nutmeg (optional but recommended)
  • 2 teaspoons Worcestershire sauce
  • 1 cup crispy fried onions
  • ½ cup panko breadcrumbs
  • 2 tablespoons melted butter

Instructions

  1. Prep the green beans: Wash and trim the stem ends, cutting into roughly 2-inch pieces. Set aside.
  2. Sauté the mushrooms and onions: Heat a large skillet over medium-high heat and add 2 tablespoons butter. Once melted, add sliced mushrooms and diced onion. Spread into an even layer and let sit for 2-3 minutes without stirring. Stir and cook for another 3-4 minutes until mushrooms release liquid and start to brown. Add minced garlic and cook for 30 seconds until fragrant.
  3. Make the sauce base: Sprinkle 2 tablespoons flour over the mushroom mixture. Stir constantly for 1-2 minutes until flour is incorporated and turns light golden.
  4. Add the liquids: Slowly pour in chicken broth while stirring. Continue stirring until mixture thickens, about 2 minutes. Then pour in heavy cream, salt, pepper, nutmeg (if using), and Worcestershire sauce. Stir until smooth. Adjust seasoning to taste.
  5. Combine in the slow cooker: Transfer trimmed green beans to a 6-quart slow cooker. Pour mushroom sauce over the top and stir gently until all beans are coated.
  6. Cook low and slow: Cover and cook on LOW for 3-4 hours or on HIGH for 1.5-2 hours. Stir once halfway through if possible.
  7. Make the topping: About 20 minutes before serving, mix crispy fried onions, panko breadcrumbs, and melted butter in a small bowl until evenly coated.
  8. Add the topping and finish: Sprinkle topping mixture evenly over the casserole. Switch slow cooker to ‘keep warm’ or turn off and let sit for 10 minutes with lid on. For extra crunch, broil topping on a baking sheet for 2-3 minutes before sprinkling.
  9. Serve immediately: Spoon into bowls or plates. Sauce should be thick and creamy. If too thin, let sit uncovered for 5 minutes to thicken.

Notes

Don’t skip sautéing the mushrooms and onions—it builds deep flavor. For a gluten-free version, use cornstarch slurry instead of flour and gluten-free panko. For a dairy-free version, use coconut cream and plant-based butter. The casserole can be made ahead and reheated. Leftovers keep in the fridge for up to 4 days or freeze for up to 3 months.

Nutrition

Keywords: green bean casserole, slow cooker, from scratch, Thanksgiving, side dish, comfort food, easy, weeknight dinner

Find it online: https://platebelle.com/quick-slow-cooker-green-bean-casserole-from-scratch/