The Best Gruyere Potatoes au Gratin Recipe - How to Cooking

Ingredients

• 3 lbs Yukon Gold or Russet Potatoes, peeled and thinly sliced (1/8 inch thick)
• 3 Tbsp unsalted butter, for greasing and roux
• 3 Tbsp all-purpose flour
• 2 cups whole milk, warmed
• 1 cup heavy cream
• 2 cloves garlic, minced finely
• 1 tsp fresh thyme leaves
• 1/4 tsp nutmeg, freshly grated
• 1 cup packed Gruyère cheese, grated
• 1/2 cup packed Parmesan cheese, freshly grated
• 5 tsp salt (to taste)
• 1/2 tsp black pepper, freshly ground