Ingredients
- 1 pound (456 g) uncooked rotini pasta (about 5 1/2 cups)
- Kosher salt
- 11 tablespoons unsalted butter, divided (5 1/2 ounces; 156 g)
- 1 1/2 pounds yellow or mixed onions (720 g; about 3 medium), thinly sliced lengthwise (6 cups)
- 1 1/2 pounds (720 g) Gruyère cheese
- 1/4 cup (60 ml) dry sherry
- 1 1/2 tablespoons chopped fresh thyme leaves, divided, plus more for garnish
- 1/3 cup all-purpose flour (1 1/2 ounces; 40 g)
- 6 cups (1.35 L) whole milk
- 1 tablespoon (15 ml) Dijon mustard
- 1 tablespoon (18 g) roasted beef bouillon (such as Better Than Bouillon)
- 1/2 teaspoon freshly ground black pepper
- 1 cup panko bread crumbs (2 1/2 ounces; 72 g)
- 1/2 cup store-bought crispy fried onions (1 ounce; 30 g), coarsely crushed
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