Au Gratin Potatoes

We use flour-thickened milk combined with a modest amount of tangy sharp Cheddar to make a creamy cheese sauce for our healthy spin on the classic potatoes au gratin recipe. They're topped with additional cheese and some breadcrumbs, then baked until golden brown and bubbling. Serve the au gratin potatoes as a Thanksgiving side or with roasted chicken and vegetables for a satisfying dinner.

Ingredients

  • 3 pounds red potatoes
  • 1 small onion, halved
  • 2 cloves garlic, peeled
  • ¼ cup all-purpose flour
  • 1 ½ teaspoons salt
  • 1 teaspoon dry mustard
  • ¼ teaspoon cayenne pepper
  • ¼ teaspoon freshly ground pepper
  • 3 cups low-fat milk, divided
  • 1 ⅓ cups shredded sharp cheddar cheese, divided
  • ½ cup plain dry breadcrumbs
  • 2 teaspoons extra-virgin olive oil