Creamy Potatoes Au Gratin | epicuricloud (Tina Verrelli)

Ingredients

• 1 tablespoon butter (for buttering dish)
• 1 clove garlic (cut in half)
• 6 ounces gruyere cheese (shredded)
• 6 ounces white cheddar cheese (shredded)
• 2 tablespoons flour
• 1 tablespoons minced fresh thyme leaves (1 teaspoon dry thyme leaves)
• 1 1/4 teaspoons salt
• 3/4 teaspoon black pepper
• 1 cup heavy cream
• 2 1/2 cups low-sodium chicken broth
• 1/4 cup dijon mustard
• 3 pounds Yukon Gold potatoes (peeled or unpeeled) (sliced 1/8-inch thick)