Ingredients
- 1 stick (8 tablespoons) unsalted butter, plus more for greasing
- One 24-inch baguette
- 2 large yellow onions, thinly sliced (about 3 pounds),
- 1 tablespoon fresh thyme leaves
- Kosher salt and freshly ground black pepper
- 1 cup dry white wine
- 1 beef bouillon cube, crumbled
- 1 cup heavy cream
- 1/4 cup chopped fresh chives
- 4 large eggs
- 6 cups grated Gruyere
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