French Beef Au Gratin

Indulge in the ultimate comfort food with this French Beef Au Gratin, a luxurious combination of tender seared beef sirloin, velvety layers of thinly sliced potatoes, and a rich cream sauce infused with garlic, onion, and aromatic thyme. Topped generously with melted Gruyère cheese, this oven-baked masterpiece delivers a golden, bubbling crust that’s as visually delightful as it is flavorful. Perfect for a cozy family dinner or an elevated holiday meal, this hearty gratin marries French culinary elegance with homestyle warmth. With just 20 minutes of prep time and simple ingredients like beef broth, heavy cream, and butter, this dish is approachable yet impressive. Pair it with a crisp salad or roasted vegetables for a complete, satisfying meal that will have everyone coming back for seconds.

Nutriscore Rating: 64/100

Prep Time:20 mins

Cook Time:60 mins

Total Time:80 mins

Servings: 4

Ingredients

• 500 grams beef sirloin
• 4 medium-sized potatoes
• 3 tablespoons butter
• 1 medium-sized, diced onion
• 2 cloves, minced garlic
• 250 milliliters heavy cream
• 150 grams grated Gruyère cheese
• 250 milliliters beef broth
• 2 tablespoons olive oil
• 1 tablespoon all-purpose flour
• 1 teaspoon fresh thyme
• 1 teaspoon salt
• 1 teaspoon black pepper

Directions

Step 1

Preheat your oven to 200°C (400°F).

Step 2

Peel and thinly slice the potatoes into rounds about 1/8 inch thick. Set them aside.

Step 3

Cut the beef sirloin into small bite-sized pieces. Season them with half of the salt and pepper.

Step 4

Heat olive oil in a large skillet over medium-high heat. Sear the beef pieces until browned, about 3-4 minutes per side. Remove the beef from the skillet and set it aside.

Step 5

Reduce the heat to medium and add 1 tablespoon of butter to the skillet. Add the diced onion and cook until softened, about 5 minutes.

Step 6

Stir in the minced garlic and cook for an additional 1 minute until fragrant.

Step 7

Add the flour to the skillet and cook for 1-2 minutes, stirring constantly to form a roux.

Step 8

Gradually pour in the beef broth, stirring constantly to prevent lumps. Let it simmer until slightly thickened, about 3-4 minutes.

Step 9

Stir in the fresh thyme, remaining salt, pepper, and heavy cream. Simmer for 2 minutes, then return the seared beef to the skillet. Remove from heat.

Step 10

Grease a baking dish with 1 tablespoon of butter. Layer half of the sliced potatoes on the bottom of the dish.

Step 11

Pour half of the beef and cream mixture over the potatoes, spreading it evenly.

Step 12

Add the remaining potatoes as a second layer, followed by the rest of the beef and cream mixture.

Step 13

Sprinkle the grated Gruyère cheese evenly over the top.

Step 14

Dot the top with the remaining butter and bake in the preheated oven for 30-35 minutes, or until the top is golden brown and bubbling.

Step 15

Let the dish rest for 5-10 minutes before serving. Serve warm and enjoy!

Nutrition Facts

Serving size	2195.9 grams (2195.9g)

Amount per serving	% Daily Value*
Calories	4085

Total Fat 267.60g	343%
Saturated Fat 134.10g	671%
Polyunsaturated Fat 3.80g
Cholesterol 946mg	315%
Sodium 5005mg	218%
Total Carbohydrate 194.10g	71%
Dietary Fiber 20.70g	74%
Total Sugars 17.40g
Protein 200.30g	401%

Vitamin D 37IU	184%
Calcium 1569mg	121%
Iron 25mg	141%
Potassium 6709mg	143%

*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: 60.4%

Protein: 20.1%

Carbs: 19.5%