French Onion Green Bean Casserole
A luxurious twist on the classic green bean casserole—layered with caramelized onions, Gruyere cheese, and buttery croutons. Inspired by French onion soup, it’s the ultimate holiday side dish that actually steals the show.
- Time: 150 min
- Servings: 8
Source: potluckeats.com
Ingredients
- medium yellow onions, halved and thinly sliced
- tablespoons unsalted butter, divided
- teaspoons kosher salt, divided
- teaspoon ground black pepper, divided
- pounds fresh green beans, trimmed and cut into 1½-inch pieces
- ounces baby bella mushrooms, sliced
- tablespoons all-purpose flour
- 2% milk
- teaspoon ground nutmeg
- croutons, crushed
- freshly grated Parmesan cheese
- shredded Gruyere cheese, divided