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Sweet Potato and Ontario Apple Gratin

This Sweet Potato and Ontario Apple Gratin is a great side dish for your next family dinner! Sweet potatoes and apples complement each others sweetness while being balanced out with shredded Gruyere cheese. Bon appetit!

8 servings

Sweet Potato and Ontario Apple Gratin
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  • 3 lbs (1.5 kg) sweet potatoes, peeled and sliced in 1/4-inch (5 mm) thick rounds
  • 1 onion, thinly sliced into rings
  • 4 Ontario apples* peeled, cored and sliced in 1/4-inch (5 mm) thick rounds
  • 1 cup (250 mL) milk
  • 1 tbsp (15 mL) all-purpose flour
  • 1/2 tsp (2.5 mL) dry mustard
  • 1/2 tsp (2.5 mL) each salt and pepper
  • 1 cup (250 mL) shredded Gruyère cheese


  1. Preheat oven to 400°F (200°C). Arrange half of the sliced sweet potatoes over the bottom of an 8-inch round (2 L) baking dish.
  2. Arrange half of the sliced onion rings over the sweet potatoes and half of the sliced apples over the onion. Repeat these layers with remaining ingredients.
  3. In medium bowl, whisk together milk, flour, mustard, salt and pepper. Drizzle over apples. Sprinkle with cheese.
  4. Cover with foil and bake in preheated oven for 45 minutes.
  5. Remove foil and bake until cheese is bubbly and golden and potatoes and apples are tender, approximately 15 minutes. Let stand 10 minutes before serving.


*For best results, use Ontario Empire, Golden Delicious, Spartan, Cortland or Northern Spy apples.

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