Potatoes au gratin (Dauphinoise Potatoes) fresh out of the oven
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4.84 from 59 votes

Potatoes au Gratin

Recipe video above. The ultimate potato bake!!! Potato + cream + cheese with a hint of garlic and thyme created by the French = pure heaven. Based on Julia Child's Potato Dauphinoise recipe. This is THE perfect make ahead potato dish.
Prep Time15 mins
Cook Time1 hr 30 mins
Total Time1 hr 45 mins
Course: Side Dish
Cuisine: French
Keyword: Dauphinoise Potatoes, Potato Bake, Potatoes au Gratin
Servings: 8 - 10 people
Calories: 167kcal
Author: Nagi

Ingredients

  • 1 1/2 cups (375 ml) cream , full fate (Note 1)
  • 2 garlic cloves , minced
  • 2 tbsp (30g) unsalted butter , melted
  • 1.25 kg / 2.5 lb starchy potatoes , Russet, Sebago, Maris Piper (Note 2)
  • 1 tsp salt
  • 1/4 tsp pepper
  • 2 1/2 cups (250g) gruyere (or mozzarella) cheese , grated (Note 3)
  • 2 tsp thyme leaves , fresh (optional - but highly recommended)

Instructions

  • Place butter, cream and garlic in a jug. Mix until combined.
  • Preheat oven to 350F/180C.
  • Peel the potatoes and slice them 1/8"/3 mm thick. Or use a slicer!
  • Spread 1/3 of the potatoes in a baking dish (Note 3), then pour over 1/3 of the cream, scatter with 1/3 of the salt, pepper and thyme. Sprinkle with 3/4 cups cheese.
  • Repeat for the 2nd and third layer, but do not finish with cheese on the top layer (will add later).
  • Cover with lid or foil, and bake for 1 hr 15 min or until the potatoes in the middle are soft (use knife to test).
  • Remove foil, top with cheese. Bake for a further 10 to 15 minutes until golden and bubbly. Stand 5 minutes before serving.

Notes

1. Cream - full fat cream is best. Heavy / thickened or even a full fat pouring cream are all great. For a slightly lighter version, use half and half (or use 1/2 cream, half milk). Don't try this with just milk.
2. Potatoes - Australia: Use Sebago ("dirt" potatoes, sold everywhere), US: Russet, UK: King Edward or Maris Piper
OR any other starchy potatoes. Dutch creams, King Edwards or red delight. Great all rounders like golden delight, coliban and red rascal are also great.
3. Cheese - Gruyere is the best as it provides flavour and browns beautifully on top. Julia Childs uses gruyere. It's quite expensive so for everyday purposes, mozzarella is an idea alternative but if you do, add an extra pinch of salt on each layer. 
Any other melting cheese will also work fine - Monterey Jack, cheddar and tasty are all cheeses I have used and love.
4. Baking Dish Size - I use a 1.5L / 1.5 Qt / 6 cup, 18 x 26 cm x 5 cm / 7 x 11 x 2" oval shape, or thereabouts but it's full to the brim so a slightly larger one would be more ideal. A 26 cm / 11" skillet also works great. A 20cm/8" square pan is too small. Larger dish is fine - just means the potatoes au gratin isn't as deep
5. Make ahead: Near perfect for make ahead! The best way (in my experience) is hold back about 1/2 cup of the cream mixture. Bake covered in foil, then cool with foil on. Pour over reserved cream, top with cheese, cover with cling wrap. Refrigerate. Remove from fridge 1 hour before, reheat covered in foil in a 180C/350F oven for 20 - 30 min or until hot, then remove foil and bake until cheese is golden. To speed things up you can microwave it then pop it in the oven (this is dense so takes quite a while to reheat in the oven, depends on depth of baking dish you use).
6. Source: Adapted from Julia Child's Dauphinoise Potatoes recipe. Hers is slightly more fiddly to put together, involves scattering finely diced butter on each layers (which I simplified by melting), only rubs garlic on baking dish (I use 2 whole cloves), and she uses less cheese. Mine gradually evolved over time from her original recipe to what mine is today!
7. Nutrition assumes 10 servings.
Nutrition Facts
Potatoes au Gratin
Amount Per Serving (110 g)
Calories 167 Calories from Fat 90
% Daily Value*
Fat 10g15%
Saturated Fat 6g38%
Cholesterol 31mg10%
Sodium 281mg12%
Potassium 364mg10%
Carbohydrates 14.2g5%
Fiber 2.1g9%
Sugar 1.6g2%
Protein 5.7g11%
Vitamin A 300IU6%
Vitamin C 23.1mg28%
Calcium 160mg16%
Iron 0.7mg4%
* Percent Daily Values are based on a 2000 calorie diet.
Au Gratin Potatoes recipe originally published December 2014, new photos, recipe video and updated post. Recipe slightly streamlined.

Nutrition

Serving: 110g | Calories: 167kcal | Carbohydrates: 14.2g | Protein: 5.7g | Fat: 10g | Saturated Fat: 6g | Cholesterol: 31mg | Sodium: 281mg | Potassium: 364mg | Fiber: 2.1g | Sugar: 1.6g | Vitamin A: 300IU | Vitamin C: 23.1mg | Calcium: 160mg | Iron: 0.7mg