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4.67 from 3 votes

Simple & Amazing Potatoes au Gratin Recipe with Yams & Sweet Potatoes

A one-pan easy and creamy potatoes au gratin recipe with three types of potatoes baked with loads of aged cheddar and gruyere!
Course Side Dish
Cuisine Canadian
Prep Time 15 minutes
Cook Time 50 minutes
Total Time 1 hour 5 minutes
Servings 12 people
Calories 302kcal
Author Julie & Debbie


  • 2 sweet potatoes
  • 2 yams
  • 5 russet potatoes
  • 1 large onion
  • 500 grams (2 cups) aged cheddar
  • 1 - 2 tbsp salt
  • 1 tbsp pepper
  • 1 tbsp garlic powder
  • 2 cups coconut milk (or regular milk if you wish)
  • 1/4 cup butter , melted and poured over the top
  • 500 g (2 cups) gruyere for the top


  • Get all your ingredients ready. Peel and slice your potatoes. Slice them thin but not too thin. We like number 2 on the mandolin. Slice your onion on the mandolin as well, or thinly with a knife. Grate all your cheese and melt the butter.
  • Pre-heat your oven to 375 degrees.
  • Put together the dish. Put a layer of potatoes, then sweet potatoes, then yams down in the pan. Add a thin layer of the onions and sprinkle all generously with salt, pepper, garlic powder, and a quarter of the aged cheddar. Repeat until the potatoes, onions and cheese are all used up. Finish with a layer of potatoes.
  • Pour the melted butter over top of all the potatoes, pour the coconut milk over top as well. Finish with all the gruyere cheese.
  • Cover with a lid or foil and bake for 30 mins. Then take the lid or foil off and bake another 15 -20 mins or until the dish is bubbling and nicely browned on top. Take out of the oven and let it sit for 5 - 10 mins before serving.
  • Enjoy!


Serving: 1(1/12 of recipe) | Calories: 302kcal | Carbohydrates: 28g | Protein: 12g | Fat: 16g | Saturated Fat: 9g | Cholesterol: 33mg | Sodium: 366mg | Potassium: 1096mg | Fiber: 4g | Sugar: 2g | Vitamin A: 4100IU | Vitamin C: 18.6mg | Calcium: 764mg | Iron: 2.9mg