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Slow Cooker Green Bean Casserole Easy Recipe for Effortless Potlucks

slow cooker green bean casserole - featured image

This slow cooker green bean casserole is a creamy, crowd-pleasing side dish perfect for potlucks and holiday gatherings. With minimal prep and classic flavors, it frees up oven space and delivers perfectly tender green beans with a crispy onion topping.

Ingredients

Scale
  • 2 pounds fresh green beans, trimmed and cut into 2-inch pieces (or 2832 oz frozen cut green beans, unthawed)
  • 2 cans (10.5 oz each) cream of mushroom soup (use low-sodium if desired)
  • 1 cup whole milk (or half-and-half for extra creaminess, or unsweetened almond milk for dairy-free)
  • 1 cup shredded cheddar cheese (optional)
  • 1 can (6 oz) crispy fried onions, plus extra for topping
  • 8 oz button mushrooms, sliced (optional)
  • 1 teaspoon garlic powder
  • 1 tablespoon soy sauce (or tamari for gluten-free)
  • 1/2 teaspoon black pepper

Instructions

  1. Rinse and trim the ends off the green beans. Cut into 2-inch pieces. If using frozen green beans, measure out and set aside (no need to thaw).
  2. In a large mixing bowl, combine cream of mushroom soup, milk, soy sauce, garlic powder, and black pepper. Whisk until smooth. Stir in shredded cheddar cheese if using.
  3. Lightly coat the inside of your slow cooker with nonstick spray. Add green beans and sliced mushrooms (if using). Pour the soup mixture over the top and gently fold to coat all the green beans.
  4. Sprinkle about half the can of crispy fried onions over the mixture and gently press them down.
  5. Cover and cook on LOW for 5-6 hours or on HIGH for 2.5-3 hours, until green beans are fork-tender and sauce is bubbling. Stir halfway through if possible.
  6. If the casserole looks too thick, add a splash more milk. If too thin, cook uncovered for the last 30 minutes.
  7. Just before serving, sprinkle the remaining crispy onions over the top. Cover and let steam for 5 minutes, or leave uncovered for crunchier onions.
  8. Serve hot, straight from the slow cooker or transfer to a serving dish.

Notes

For gluten-free, use gluten-free mushroom soup and crispy onions. For dairy-free, use plant-based milk and cheese. Add crispy onions just before serving for best texture. Prep the night before and refrigerate the insert for easy make-ahead. Stir gently halfway through for even cooking. Add cooked bacon or smoked paprika for extra flavor. Leftovers keep well for up to 4 days in the fridge.

Nutrition

Keywords: slow cooker, green bean casserole, potluck, holiday side, easy, creamy, vegetarian, Thanksgiving, Christmas, comfort food