Healthy Green Bean Casserole: Easy Low-Calorie Holiday Side

Our healthy green bean casserole is a fresh take on the holiday classic. We skip the canned soup and fried onions, instead making a creamy sauce from scratch with fresh mushrooms, low-fat milk and a crunchy homemade onion topping. The result? A casserole that’s 120 calories and 11g saturated fat lighter per serving than the original!

Photos

Imagine a golden-brown casserole dish fresh from the oven, topped with crispy onion slices over vibrant green beans in a creamy sauce. Steam rises gently, capturing the comforting essence of holiday meals made healthier.

How to Make Healthy Green Bean Casserole

This recipe reimagines the traditional green bean casserole by replacing high-fat canned cream of mushroom soup with a homemade sauce built from sautéed onions and mushrooms, thickened with flour and enriched with low-fat milk, sherry, reduced-fat sour cream, and buttermilk powder for tangy depth. Frozen green beans ensure convenience and perfect texture, while the topping—sliced onions dredged in a spiced flour mix and sautéed until crisp—delivers that irresistible crunch without deep-frying. The entire dish bakes up bubbly and hot, ready to serve 9 as a side in just over an hour. It’s an ideal make-ahead option: assemble up to a day ahead, refrigerate, and bake when ready, adding extra time if needed straight from the fridge.

Green Bean Casserole Ingredients

This healthier version relies on simple, whole-food ingredients to mimic the richness of the original while cutting fat and sodium dramatically.

• 1 ½ pounds frozen whole green beans (6 cups): Pre-trimmed and blanched for optimal tenderness—no fresh bean blanching required.
• 4 teaspoons unsalted butter, divided: A touch for sautéing onions and assembling.
• 10 ounces mushrooms, sliced: Cremini or white button mushrooms add umami and bulk to the sauce.
• 2 ¼ cups low-fat milk, divided: Creates a creamy base without full-fat dairy.
• ⅓ cup all-purpose flour: Thickens the sauce naturally.
• 1 teaspoon dry mustard and ¼ teaspoon garlic powder: Subtle seasoning boosts savory notes.
• 1 teaspoon salt, divided: Balances flavors.
• ½ teaspoon ground pepper, divided: Freshly ground for best taste.
• ⅛ teaspoon ground thyme: Herbal warmth complements mushrooms.
• ¾ cup finely chopped onion: Forms the sauce’s aromatic base.
• 3 tablespoons dry sherry: Real sherry (not cooking sherry, which is high-sodium) adds sophisticated depth—find it in the liquor aisle.
• ¼ cup reduced-fat sour cream: Contributes creaminess with fewer calories.
• ¼ cup buttermilk powder: Found in baking aisles, it imparts tangy richness without liquid.
• 1 large egg, lightly beaten: Binds the mixture for cohesion.
• 2 cups thinly sliced onions, separated into rings: For the crunchy topping.
• ¼ cup all-purpose flour (for topping): Coats onions lightly.
• ¼ teaspoon garlic powder (for topping), ¼ teaspoon salt (for topping), and ⅛ teaspoon paprika: Seasoning mix for savory crispiness.
• 2 tablespoons canola oil: For sautéing the topping healthfully.

Tip

Buttermilk powder adds a tangy nuance to the sauce. Look for it in the baking aisle of large supermarkets.

Directions

Follow these steps for a perfect healthy green bean casserole. Total time: 1 hr 25 mins. Active: 45 mins. Makes: 9 servings.

1. Preheat oven to 425°F. Coat a 2 ½-quart baking dish with cooking spray.
2. Prepare green beans: Place frozen beans in a large microwave-safe bowl. Cover with plastic wrap, leaving a small vent; microwave on High until just tender, about 6 minutes. Drain well and set aside.
3. Make sauce: Meanwhile, melt 1 teaspoon butter in a large saucepan over medium heat. Add mushrooms, ½ teaspoon salt, ¼ teaspoon pepper, and thyme; cook, stirring, until softened, 6 to 8 minutes. Transfer to a plate.
4. Build base: Melt remaining 3 teaspoons butter in the pan over medium heat. Add chopped onion; cook, stirring, until softened, about 3 minutes. Sprinkle with ⅓ cup flour, mustard, and garlic powder; cook, stirring, for 1 minute. Gradually whisk in 2 cups milk; cook, whisking, until thickened, 2 to 3 minutes. Add sherry and cook, stirring, for 30 seconds. Remove from heat and whisk in sour cream, buttermilk powder, and remaining ¼ cup milk. Add the reserved green beans and mushrooms; stir to combine.
5. Assemble: Whisk egg in a large bowl. Slowly add 1 cup of the green bean mixture, whisking constantly. Stir the egg mixture back into the remaining green bean mixture. Transfer to the prepared baking dish.
6. Prepare topping: Toss sliced onions with ¼ cup flour, garlic powder, salt, and paprika in a large bowl until evenly coated. Heat oil in a large nonstick skillet over medium-high heat. Add the onions and cook, stirring often, until golden and crispy, 4 to 6 minutes. Drain on a paper towel.
7. Bake: Sprinkle the crispy onions over the casserole. Bake until bubbling, 20 to 25 minutes.

Equipment

• 2 ½-quart baking dish
• Large microwave-safe bowl
• Plastic wrap
• Large saucepan
• Whisk
• Large bowl
• Large nonstick skillet
• Paper towels

Make Ahead Tip

Prepare through Step 5; cover and refrigerate for up to 1 day. Let stand at room temperature for 30 minutes before topping with onions (Step 6) and baking (Step 7). Add 10 minutes to the baking time if necessary.

Originally appeared

November/December 2010

Nutrition Information

Nutrition per serving: 160 calories, 20g carbs, 7g protein, 6g fat (2g sat fat), 29mg cholesterol, 446mg sodium, 4g fiber, 9g total sugars (0g added). Excellent source of vitamin C and folate.

To make ahead

Prepare through Step 5, cover, and refrigerate for up to 1 day. Resume with topping and baking, adding time if cold.

Frequently Asked Questions

Can I use fresh green beans instead of frozen?

Yes, but blanch 1 ½ pounds fresh green beans in boiling water for 5 minutes, then shock in ice water and drain well before using.

What if I can’t find buttermilk powder?

Substitute with ¼ cup low-fat buttermilk mixed into the sauce, reducing the added milk by that amount to maintain consistency.

Is sherry necessary, and what type?

Sherry adds unique flavor; use dry sherry from the liquor store, not high-sodium cooking sherry. Omit for alcohol-free, but flavor will differ slightly.

Can I make this gluten-free?

Replace all-purpose flour with a 1:1 gluten-free flour blend. Ensure sherry is gluten-free if concerned.

How do I store leftovers?

Cover and refrigerate up to 3 days. Reheat in a 350°F oven for 15-20 minutes until hot.

Why use frozen green beans?

Frozen beans are picked at peak freshness, blanched, and retain nutrients and texture better than canned, without the need for extra prep.

Health Benefits of Green Bean Casserole

Green beans provide fiber, vitamins A, C, and K, supporting digestion and immunity. Mushrooms offer antioxidants and B vitamins. Using low-fat dairy and minimal oil reduces saturated fat while preserving creaminess. This dish boosts veggie intake at holiday meals, with each serving delivering over 4g fiber and substantial vitamin C.

Holiday Tips and Variations

For Thanksgiving or Christmas, scale up for crowds. Add cooked turkey or ham for a main dish. Veganize by using plant-based milk, sour cream alternative, and skip the egg—thicken with extra flour slurry. Spice it with cayenne in the topping for heat.

Pair with roasted turkey, mashed potatoes, and cranberry sauce for a balanced plate. This casserole proves holiday favorites can be nutritious without sacrificing taste.

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Author

Sneha TeteBeauty & Lifestyle Writer

 

Sneha is a relationships and lifestyle writer with a strong foundation in applied linguistics and certified training in relationship coaching. She brings over five years of writing experience to renewcure,  crafting thoughtful, research-driven content that empowers readers to build healthier relationships, boost emotional well-being, and embrace holistic living.

Read full bio of Sneha Tete