Ingredients
3 tbsp. unsalted butter, softened, divided, plus more for foil
4 tsp. cloves garlic, chopped
2 tbsp. chopped fresh thyme leaves, plus more for serving
1 tbsp. chopped fresh sage leaves
Kosher salt
1 c. heavy cream
3/4 c. whole milk
1/4 tsp. ground cinnamon
1/4 tsp. ground nutmeg
2 large eggs
3/4 c. grated Parmesan (about 2 oz.), divided
Freshly ground black pepper
2 lb. sweet potatoes (mix of purple, orange, and white), peeled and sliced 1/8″ thick
2 2/3 c. shredded Gruyère cheese (about 8 1/2 oz.), divided
Directions
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