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The Best Homemade Healthy Green Bean Casserole

A lightened-up, from-scratch green bean casserole made with fresh green beans, a creamy homemade mushroom sauce, and a crispy onion topping.
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Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes
Servings: 6 servings
Course: Dinner, Side Dish
Cuisine: American, Holiday
Calories: 190
Ingredients Equipment Method Notes

Ingredients
  

Casserole
  • 1.5 lbs green beans trimmed and halved
  • 1 tbsp olive oil
  • 1 onion diced
  • 3 cloves garlic minced
  • 8 oz mushrooms sliced
  • 1 tbsp butter
  • 2 tbsp flour
  • 1 cup broth chicken or vegetable
  • 1 cup milk
  • 0.5 cup Greek yogurt optional for creaminess
  • 0.5 tsp salt
  • 0.5 tsp black pepper
  • 0.5 tsp thyme
Topping
  • 0.75 cup crispy fried onions
  • 0.25 cup panko breadcrumbs optional

Equipment

  • Skillet
  • Saucepan
  • Baking dish
  • Whisk

Method
 

  1. Boil green beans 3–4 minutes, then transfer to ice water.
  2. Sauté onions, garlic, and mushrooms in olive oil.
  3. Add butter, then flour, creating a roux.
  4. Slowly whisk in broth and milk; simmer to thicken.
  5. Stir in Greek yogurt off heat, then add salt, pepper, and thyme.
  6. Combine sauce with green beans and transfer to a baking dish.
  7. Bake at 375°F (190°C) for 20 minutes.
  8. Top with crispy onions and bake 5–8 more minutes.

Notes

Add topping right before final bake to keep it crisp.