Sliced Potatoes:

• 3 medium sweet potatoes
• 6 small Yukon gold potatoes

Seasonings:

• 1 teaspoon kosher salt
• 1/4 teaspoon ground black pepper
• 3/4 teaspoon garlic powder
• 1/2 teaspoon dried thyme
• 1/2 teaspoon ground sage
• 1 1/2 teaspoons dried parsley (or 1–2 tablespoons fresh chopped parsley)
• 1/2 teaspoon dried rosemary (or 2 teaspoons fresh rosemary finely minced)

Additional Ingredients:

• 1 tablespoon olive oil
• 8 ounces Gruyère or sharp white cheddar, grated (2 cups)
• 1/2 cup thinly sliced yellow onion, chopped
• 1/2 cup whole milk or half-and-half
• 1/2 cup low-sodium chicken broth