Potato and Celery Root Gratin
Ingredients
- nonstick cooking spray
- 2 large celery roots, peeled, halved, and thinly sliced
- 5 large Yukon gold potatoes, peeled and thinly sliced
- kosher salt and black pepper
- 5 tablespoons unsalted butter
- 6 tablespoons all-purpose flour
- 3½ cups whole milk
- 12 ounces gruyere, grated, divided
- 1 teaspoon freshly grated nutmeg
- 3 tablespoons chopped parsley
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