Ham and Gruyère Potato Gratin

Ingredients

• 2 teaspoons butter
• 4 ounces less-sodium reduced-fat ham, chopped
• 2 ½ cups 1% low-fat milk
• 2 tablespoons all-purpose flour
• ½ teaspoon black pepper
• ½ cup finely chopped onion
• 1 cup (4 ounces) shredded Gruyère cheese, divided
• + 3 more ingredients
• • 2 pounds Yukon Gold potatoes, cut into 1/8-inch-thick slices (about 6 1/2 cups)
  • Cooking spray
  • ¾ teaspoon salt

Preheat oven to 350°. Combine first 4 ingredients, stirring with a whisk; set aside. Heat butter in a medium saucepan over medium heat. Add onion; cook 3 minutes or until tender, stirring frequently. Stir in milk mixture; bring to a boil. Cook for 2 minutes, stirring constantly. Remove from heat;...

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