Cheesy Cauliflower au Gratin
Ingredients
- 2 1/2 pounds cauliflower
- 3 teaspoons kosher salt, divided, plus more for seasoning
- 1 teaspoon freshly ground black pepper, divided, plus more for seasoning
- 1/2 large yellow onion
- 6 large cloves garlic
- 6 ounces Gruyère cheese
- 6 ounces sharp cheddar cheese
- 8 tablespoons unsalted butter, divided
- 3 sprigs fresh thyme
- 1 tablespoon Dijon mustard
- 1/2 cup all-purpose flour
- 3 cups whole milk
- 1 cup panko breadcrumbs
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