Ingredients
1 lb. Green beans, trimmed
6 tbsp. Butter, divided
1 onion, sliced into half moons
8 oz. Sliced mushrooms
Kosher salt
freshly ground black pepper
2 cloves garlic, minced
¼ cup all purpose flour
3 cups whole milk
1 ½ cups French’s fried onions
Directions
1)Preheat oven to 350 degrees. Prepare an ice bath: In a large pot of boiling water, add green beans and cook until bright green, about 6 minutes. With a slotted spoon or tongs, quickly transfer green beans to ice bath to cool, then drain and transfer to a large bowl.
2) In a large ovenproof skillet over medium heat, melt 2 tablespoons butter. Add onion and cook, stirring occasionally, until tender, about 5 minutes. Add mushrooms and season with salt and pepper. Cook, stirring often, until mushrooms are golden, about 5 minutes more. Stir in garlic and cook until fragrant, 1 minute, then transfer mixture to green bean bowl.
3) In same skillet over medium heat, melt remaining 4 tablespoons butter. Whisk in flour and cook until golden, about 2 minutes. Gradually whisk in milk and season with salt and pepper. Bring to a simmer and cook until thickened, about 4 minutes. Remove from heat, then add green bean mixture and toss until evenly combined.
4) Bake until warmed through and bubbling, about 30 minutes.
5) Top with fried onions and bake 5 minutes more.