Get ready to upgrade your holiday side dish with this Smoked Green Bean Casserole. Ditch the canned soup and make this classic from scratch: fresh green beans tossed in a rich homemade béchamel, layered with sautéed mushrooms, crispy bacon, and a crunchy Parmesan-Panko topping. A touch of Cajun seasoning gives the dish a gentle heat and depth, while a short smoke on a pellet grill adds an irresistible wood-fired note.
This is not the tired, run-of-the-mill green bean casserole. It’s loaded with cheese and bacon, brightened with garlic and onion, and finished under smoke for a memorable holiday side. The mushrooms add earthiness and texture, the béchamel creates a silky, thick sauce, and the breadcrumb topping gives it all a golden crunch. Whether you’re serving it alongside smoked turkey or prime rib, this casserole will stand out on any holiday table.
💪 Why This Smoked Green Bean Casserole?
- A modern, from-scratch take on the classic green bean casserole that tastes far superior to the canned-soup version.
- Quick prep—about 20 minutes—so you can balance multiple dishes on the smoker.
- Add Cajun seasoning for a warm, savory kick that pairs beautifully with the cream sauce.
- Finishing the casserole in a pellet grill or smoker adds a subtle smoky layer of flavor that transforms a familiar dish.
- The béchamel-based sauce is easy to make and creates a luxurious texture that elevates the green beans.
- Flexible: omit the bacon for a vegetarian version, or swap cheeses and toppings to match your taste.
🍽 Ingredients for the Perfect Casserole
These ingredients are easy to find and assemble into a comforting, smoky side. Refer to the recipe card below for exact quantities and full instructions.
- Fresh green beans — bright, crisp, and blanched to preserve color and texture. Frozen can work if fully thawed and drained.
- Bacon — cooked until crispy and chopped for texture and savory flavor. Omit for vegetarian versions.
- Baby bella (crimini) mushrooms — sautéed until moisture cooks off to concentrate their flavor.
- Onion and garlic — aromatic base that builds savory depth in the sauce.
- Chicken or vegetable broth — adds savory body to the béchamel; don’t replace with plain water.
- Heavy cream — creates the rich sauce; half-and-half or whole milk can be substituted for a lighter version.
- White wine — optional but recommended; its acidity balances the richness of the cream.
- Flour — used to form the roux that thickens the béchamel.
- Parmesan cheese — folded into the sauce and mixed into the breadcrumb topping for umami and richness.
- Panko breadcrumbs — for maximum crunch on top; swap for fried onions if preferred.
- Spices — Cajun seasoning, salt, pepper, and fresh parsley for finishing.
👨🍳 How to Make Green Bean Casserole on the Smoker
Below is a clear overview of the process. Exact temperatures, timings, and measurements are listed in the recipe card at the bottom.
Prepare the Ingredients
- Preheat your pellet grill or smoker to a low smoking temperature for the initial cook, then increase for browning if needed.
- Chop and fry the bacon until crispy; drain and set aside so it keeps its crunch.
- Blanch fresh green beans in boiling salted water for about 5 minutes, then plunge into an ice bath to stop cooking.
- Mix the Panko, grated Parmesan, parsley, olive oil, and a pinch of salt to make the crunchy topping.
Assemble and Smoke the Casserole
- Sauté the onion in olive oil until soft and beginning to caramelize.
- Add mushrooms and cook until their moisture evaporates, then stir in the garlic.
- Sprinkle flour over the vegetables and cook briefly to eliminate the raw flour taste.
- Gradually whisk in white wine, chicken broth, and cream, then simmer until the sauce thickens to a gravy-like consistency.
- Stir in grated Parmesan, Cajun seasoning, salt, and pepper. Fold in the blanched green beans and most of the crispy bacon.
- Transfer the mixture to a casserole dish, top with the Panko-Parmesan mixture and reserved bacon, and place the dish in the smoker.
- Smoke until the sauce is bubbling and the topping is golden, about 30–40 minutes. If the topping needs extra color, raise the smoker temperature toward the end of cooking for a short period.
😉 Recipe Tips – Don’t Get Smoked!
- Crispy bacon matters. Cook bacon separately to ensure it stays crunchy and fold most of it into the casserole while reserving some for the topping.
- Try different wood pellets. Hickory, apple, or cherry all pair well; experiment to find the flavor profile you prefer.
- Watch the breadcrumb topping. Smoke until the sauce bubbles and the crumbs are turning golden. If needed, raise the smoker temperature briefly to brown the top without drying the casserole.
- Use fresh green beans when possible. Blanch briefly so they remain vibrant and slightly crisp. If using frozen, thaw and drain thoroughly.
- Sauce consistency. Cook the flour long enough to remove any raw taste. Add liquids slowly and whisk to avoid lumps; the sauce should coat the back of a spoon.
🤔 Casserole Substitutions and Variations
- Topping swaps: Use toasted sliced almonds and lemon zest for brightness, crushed fried onions for classic flavor, or gluten-free crumbs if needed.
- Different cheeses: Sharp cheddar or Gruyère will make the casserole even more indulgent and cheesy.
- Southwestern twist: Add roasted poblano peppers and corn, and finish with crushed tortilla chips and cheddar for a bold flavor profile.
🥡 Storing and Reheating Smoked Green Bean Casserole
Allow the casserole to cool, then transfer leftovers to an airtight container. Refrigerate for 3–4 days.
To reheat, use short microwave bursts for single servings or rewarm in a 350°F oven for 15–20 minutes for larger portions. If preparing ahead, assemble and refrigerate without the topping; add topping and bake or smoke when ready to serve.
🤤 More Smoked Side Dishes
Traeger
Smoked Brussels Sprouts
Side Dishes
Traeger Smoked Asparagus
Traeger
Smoked Cauliflower
Side Dishes
Traeger Au Gratin Potatoes
❓ FAQ for this Casserole Recipe
Fresh green beans give the best flavor and texture. If fresh aren’t available, use frozen that have been fully thawed and drained. Avoid canned green beans when possible, as they tend to be soft and lack fresh flavor.
Blanch the green beans briefly and immediately cool them in an ice bath to stop cooking. Don’t overcook the assembled casserole in the smoker; remove it when the sauce is bubbling and the topping is golden.
Yes. Assemble the casserole up to the point of adding the crunchy topping, refrigerate, then add the topping and finish in the smoker or oven when you’re ready to serve.
🍗 Main Dishes for the Smoker
Traeger
3-2-1 Ribs
Traeger
Pellet Grill Smoked Turkey
Main Dish
Brown Sugar Bourbon Brined Smoked Turkey
Traeger
Traeger Smoked Spatchcock Turkey
Traeger
Traeger Prime Rib
🎁 Final Scoop
Bring something memorable to your next holiday table. This smoked, from-scratch green bean casserole replaces the canned soup with a silky béchamel, earthy mushrooms, and savory bacon, then tops it all with a crispy Panko-Parmesan finish. The short smoke adds a subtle, irresistible layer that makes the dish special. Serve it warm and let the compliments roll in.
If you try this recipe, toss a comment below and share how you customized it—cheese swaps, topping ideas, and wood choices are all welcome.
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Creamy Smoked Green Bean Casserole
By Joshua Boquist
Summary: A smoky twist on the classic holiday side with fresh green beans, crispy bacon, sautéed mushrooms, homemade cream sauce, Cajun seasoning, and a crunchy Panko-Parmesan topping.
Course: Main Dish | Cuisine: American
Prep: 20 mins | Cook: 40 mins | Total: 1 hr | Servings: 12
Equipment
- Pellet grill or smoker
- Large pot for blanching
- Cast iron skillet or large saucepan
- Casserole dish
Ingredients
For the Crunchy Topping
- ¾ cup panko breadcrumbs
- ¼ cup grated Parmesan
- ¼ cup chopped parsley
- 1 tbsp olive oil
- ½ tsp salt
For the Casserole
- 1½ lb fresh green beans, trimmed and halved
- 1 lb bacon, chopped
- 1 large white onion, thinly sliced
- 16 oz baby bella mushrooms, sliced
- 4 cloves garlic, minced
- 3 tbsp flour
- ⅓ cup white wine (optional)
- 1 cup chicken or vegetable broth
- ¾ cup heavy whipping cream
- ½ cup grated Parmesan
- 1 tsp salt, ½ tsp black pepper
- 1 tbsp Cajun seasoning (or preferred seasoning blend)
Instructions
- Preheat your pellet smoker to 250°F for smoking, with the option to raise heat near the end for browning.
- Combine the topping ingredients in a small bowl and set aside.
- Bring a large pot of salted water to a boil and blanch the green beans for about 5 minutes. Transfer immediately to ice water, then drain and set aside.
- In a skillet, heat olive oil and cook onions until caramelized, about 10 minutes. Add mushrooms and cook until their moisture evaporates, about another 10 minutes.
- Add garlic and cook briefly, then sprinkle flour over the vegetables and stir to combine.
- Slowly whisk in white wine, broth, and cream until smooth. Simmer for about 5 minutes until the sauce thickens.
- Stir in Parmesan, salt, pepper, and Cajun seasoning. Fold in the bacon and blanched green beans. Transfer to a casserole dish if needed.
- Top with the Panko-Parmesan mixture and remaining bacon. Smoke for about 40 minutes or until the sauce bubbles and the topping turns golden. Let rest 10–15 minutes before serving.
Notes
- Boil green beans only briefly so they stay crisp-tender.
- Customize the breadcrumb topping with nuts, citrus zest, or fried onions.
- If the topping isn’t browning, increase smoker temperature briefly toward the end.
Nutrition
Calories: ~328 kcal per serving (approximate).