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This delicious Potato and Onion Bake is the ultimate comfort food and a firm family favorite.

A golden-brown potato gratin, a classic among comforting food recipes, baked in a white scalloped dish and garnished with fresh herbs, sits on a grey countertop near mushrooms, a blue-striped towel, and a sprig of thyme.
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To make it, arrange scalloped potatoes on a base of caramelized onions, top with a mustard-and-garlic cream sauce, and bake it until bubbly and golden. What’s not to love?

This easy recipe is an excellent alternative to plain oven-roasted potatoes, and a versatile side dish that pairs well with most proteins and a simple green salad. Serve it for everyday dinners, special occasions, and the holidays.

Recipe Tip

You can make the dish in advance and reheat it 20 minutes before serving. 

More Potato Sides

A freshly baked potato gratin, perfect for hearty food recipes, sits in a round white ceramic dish topped with golden melted cheese and fresh herbs, beside brown onions and a blue-striped cloth on a gray surface.
Servings: 7 people

Potato and Onion Bake

Caramelized onion and potato bake with a garlic cream sauce baked until bubbly and golden.
Prep: 1 hour 15 minutes
Cook: 45 minutes
Total: 1 hour
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Equipment

Ingredients 

  • 1 kg potatoes, 2 pounds
  • 3 onions, medium
  • 25 grams butter, 2 tablespoons
  • 400 ml heavy cream
  • 2 tablespoons mustard
  • 2 cloves garlic
  • 1/2 tsp nutmeg
  • 100 grams cheddar, grated
  • sea salt, to taste
  • black pepper, to taste
  • fresh thyme

Instructions 

  • Preheat oven to 180° C / 355°F.
  • Peel the potatoes.
  • Slice the potatoes using a mandolin.
  • Dice the onion.
  • Heat the butter in a medium-hot pan (you can also use olive oil) and throw in the chopped onions.
  • Fry until golden brown.
  • Place the onion at the bottom of your serving dish. Use the back of a spoon to spread it around.
  • Arrange the sliced potatoes around the dish’s perimeter, working your way towards the center.
  • Mix the mustard, grated garlic, heavy cream, nutmeg, sea salt, and pepper.
  • Pour the cream mixture over the potatoes.
  • Top with the grated cheddar.
  • Bake at 180° C / 355°F for 40-45 minutes until the cheese is crispy and golden brown. You can grill for 2-3 minutes if you like – keep an eye out that the cheese doesn’t burn.
  • Remove from the oven and allow to set slightly.
  • Sprinkle with fresh thyme and serve.

Video

Nutrition

Calories: 413kcal, Carbohydrates: 32g, Protein: 9g, Fat: 29g, Saturated Fat: 18g, Polyunsaturated Fat: 1g, Monounsaturated Fat: 7g, Trans Fat: 0.1g, Cholesterol: 87mg, Sodium: 190mg, Potassium: 747mg, Fiber: 4g, Sugar: 5g, Vitamin A: 1084IU, Vitamin C: 32mg, Calcium: 172mg, Iron: 1mg

Nutrition information is automatically calculated, so should only be used as an approximation.

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