Cheesy Scalloped Potato Casserole | Publix Super Markets

Ingredients

• 1 medium yellow onion
• 4 cloves garlic
• 1/4 cup unsalted butter
• 1/2 teaspoon dried thyme
• 1/2 teaspoon dried basil
• 1 teaspoon freeze-dried chives
• 1 teaspoon Greek seasoning
• 1 tablespoon whole-grain mustard
• 2 lb russet potatoes
• 3 tablespoons all-purpose flour
• 4 cups whole milk
• 5 oz shredded Parmesan cheese
• 5 oz shredded Swiss cheese
• 8 oz shredded cheddar Jack cheese, divided
• Cooking spray
• 1 1/2 cups panko bread crumbs
• 2 tablespoons fresh chives