This post may contain affiliate links. Please see our disclosure policy.

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.
Save this recipe!
I’ll send it straight to your inbox! Plus you’ll get new recipes weekly!

Beautifully arranged scalloped potatoes on a caramelized onion base with a mustard and garlic cream sauce baked to golden perfection. What’s not to love?

This easy onion potato bake recipe is an excellent alternative to oven-roasted potatoes.

A baked gratin in a scalloped white dish sits on a gray surface. Beside it are three onions, fresh thyme sprigs on a round marble board, and a blue-and-white striped cloth.

It’s a versatile side dish that pairs well with most proteins and a simple salad.

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

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
Pin Rate Print
Save this recipe!
Share your email and I’ll send it straight to your inbox! Plus you’ll get new recipes weekly!

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.

Did you make this recipe? Leave a comment below!

❤️ Our Recipe? Try These Next!

Leave a comment

Your email address will not be published. Required fields are marked *

Recipe Rating