Golden Potato and Onion Gratin

Indulge in the ultimate comfort dish with this Golden Potato and Onion Gratin, a creamy, cheesy masterpiece that melts in your mouth with every bite. Perfectly layered slices of tender Yukon Gold potatoes and sweet yellow onions are nestled in a rich blend of heavy cream, whole milk, and aromatic garlic, heightened by the earthy notes of fresh thyme. Topped with a luxurious combination of Gruyère and Parmesan cheeses, this hearty gratin boasts a golden, bubbling crust that’s irresistibly crisp. Ideal for family dinners or holiday gatherings, this easy-to-make, oven-baked recipe pairs beautifully with roasted meats or a fresh green salad. Ready in just 20 minutes of prep time and baked to perfection, it’s the ultimate side dish for any occasion. Keywords: potato gratin, cheesy potato bake, creamy side dish, Yukon Gold potato recipe, layered potato casserole.

Nutriscore Rating: 61/100

Prep Time:20 mins

Cook Time:60 mins

Total Time:80 mins

Servings: 6

Ingredients

• 6 medium-sized Yukon Gold potatoes
• 1 large Yellow onion
• 2 cups Heavy cream
• 1 cup Whole milk
• 2 cloves Garlic
• 1 tablespoon Unsalted butter
• 1 teaspoon Fresh thyme
• 1.5 teaspoons Salt
• 0.5 teaspoon Ground black pepper
• 1.5 cups Gruyère cheese, shredded
• 0.5 cup Parmesan cheese, grated
• 1 tablespoon All-purpose flour

Directions

Step 1

Preheat your oven to 375°F (190°C). Grease a 9x13-inch baking dish with butter or non-stick spray.

Step 2

Peel the Yukon Gold potatoes and slice them into 1/8-inch thick rounds using a sharp knife or a mandoline slicer for even slicing.

Step 3

Peel and thinly slice the yellow onion into half-moons.

Step 4

In a medium saucepan, melt the butter over medium heat. Add the minced garlic and cook for 30 seconds until fragrant.

Step 5

Pour the heavy cream and whole milk into the saucepan, stirring to combine. Add the thyme, salt, and black pepper. Bring the mixture to a gentle simmer, then remove from heat.

Step 6

Layer one-third of the sliced potatoes evenly in the prepared baking dish. Top with one-third of the sliced onions. Sprinkle about 1/2 cup of shredded Gruyère cheese and 1 tablespoon of grated Parmesan cheese over the layer.

Step 7

Repeat the layering process two more times (potatoes, onions, cheeses), ending with the cheeses on top.

Step 8

Slowly pour the warm cream mixture evenly over the layered potato gratin, ensuring it seeps through the layers.

Step 9

Sprinkle 1 tablespoon of all-purpose flour evenly across the top layer of cheese to help the ingredients bind and brown.

Step 10

Cover the dish loosely with aluminum foil and bake in the preheated oven for 40 minutes.

Step 11

After 40 minutes, remove the foil and bake for an additional 20 minutes, or until the top is golden brown and the potatoes are tender when pierced with a fork.

Step 12

Let the gratin rest for 10 minutes before serving to allow it to set. Serve warm and enjoy!

Nutrition Facts

Serving size	(2320.2g)

Amount per serving	% Daily Value*
Calories	3662.0

Total Fat 246.9g	0%
Saturated Fat 145.6g	0%
Polyunsaturated Fat 0.3g
Cholesterol 760.3mg	0%
Sodium 5761.6mg	0%
Total Carbohydrate 245.2g	0%
Dietary Fiber 19.5g	0%
Total Sugars 26.3g
Protein 99.4g	0%

Vitamin D 143.4IU	0%
Calcium 2575.7mg	0%
Iron 10.6mg	0%
Potassium 5783.9mg	0%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 61.7%

Protein: 11.0%

Carbs: 27.2%