Green Bean Casserole with Savory-Umami Béchamel

Ingredients

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2 lbs fresh green beans, trimmed and cut into 2-inch pieces

Salt for blanching water

4 tbsp unsalted butter

2 large shallots, finely minced

3 cloves garlic, minced

4 tbsp all-purpose flour

2 cups whole milk

1 cup chicken stock (or vegetable stock)

2 sprigs fresh thyme

1 bay leaf

1 tsp soy sauce

¾ cup freshly grated Parmesan cheese

1 tsp fresh lemon juice

½ tsp white pepper

Salt to taste

Pinch of nutmeg

6-8 large shallots, thinly sliced into rings

1 cup all-purpose flour

1 tsp garlic powder

1 tsp paprika

½ tsp cayenne pepper (optional)

Salt and black pepper

Vegetable oil for frying (or use store-bought fried onions)

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Instructions

1. Bring a large pot of salted water to a boil

2. Prepare an ice bath in a large bowl

3. Blanch green beans for 3-4 minutes until bright green and crisp-tender

4. Immediately transfer to ice bath to stop cooking

5. Drain well and pat dry; set aside

6. Infuse the milk: In a small saucepan, gently heat milk with thyme sprigs, bay leaf, and 1 smashed garlic clove. Bring just to a simmer, remove from heat, and let steep for 10 minutes. Strain and discard aromatics.

7. Build the base: In a large skillet or saucepan over medium heat, melt butter. Add minced shallots and cook for 4-5 minutes until softened and lightly golden. Add remaining minced garlic and cook 1 minute more until fragrant.

8. Make the roux: Sprinkle flour over the shallot mixture and stir constantly for 2 minutes to cook out the raw flour taste.

9. Add liquids: Gradually whisk in the infused milk and chicken stock, about ½ cup at a time, whisking constantly to prevent lumps. Continue whisking until sauce comes to a gentle simmer.

10. Thicken and season: Reduce heat to low and simmer for 5-7 minutes, stirring frequently, until sauce coats the back of a spoon.

11. Finish the sauce: Remove from heat. Whisk in soy sauce. Stir in Parmesan cheese until melted. Season with lemon juice, white pepper, nutmeg, and salt to taste. The sauce should be creamy and coat the beans nicely but not be too thick (it will thicken more in the oven).

12. Separate shallot slices into rings

13. In a shallow bowl, combine flour, garlic powder, paprika, cayenne, salt, and pepper

14. Heat ½ inch of oil in a heavy skillet to 350°F

15. Toss shallot rings in flour mixture, shaking off excess

16. Fry in batches until golden brown, 2-3 minutes

17. Drain on paper towels and season with salt

18. Preheat oven to 375°F

19. In a large bowl, combine blanched green beans with the béchamel sauce, tossing to coat evenly

20. Transfer to a buttered 9x13-inch baking dish or similar casserole dish

21. Bake uncovered for 20 minutes until bubbling around the edges

22. Top with crispy fried shallots and bake an additional 5-10 minutes until shallots are heated through and casserole is bubbling throughout

Let rest 5 minutes before serving to allow sauce to set slightly.

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Make-Ahead Tips

Green beans: Blanch up to 2 days ahead; store in refrigerator

Béchamel: Make up to 2 days ahead; store covered in refrigerator. Rewarm gently, adding a splash of milk if needed

Crispy shallots: Make up to 3 days ahead; store in airtight container at room temperature

Full assembly: Assemble casserole (without shallot topping) up to 1 day ahead. Cover and refrigerate. Add 10 minutes to baking time if baking from cold. Add shallots during last 5-10 minutes.

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Notes

The combination of soy sauce and extra Parmesan creates incredible umami depth - the soy sauce adds savory complexity while the cheese provides richness and body

Don't skip the lemon juice at the end - it brightens the whole dish

If sauce seems too thick when assembling, thin with a splash of milk or stock

Crispy shallots are more refined and sweeter than regular onions - worth the extra effort. For a shortcut, store-bought crispy fried onions (French's brand) work in a pinch

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Serves: 8-10 as a side dish