Carrot Potato and Onion Gratin

Elevate comfort food to gourmet status with this rich and creamy Carrot Potato and Onion Gratin, a perfect side dish for any occasion. This delightful recipe layers thinly sliced carrots, potatoes, and onions, which are infused with a velvety garlic and thyme cream sauce and topped with a golden crust of Gruyère cheese and buttery breadcrumbs. The marriage of earthy root vegetables, warming nutmeg, and nutty cheese creates a depth of flavor that transforms simple ingredients into something sensational. Ready in just under 90 minutes and ideal for serving six, this gratin is as perfect for weeknight dinners as it is for holiday feasts. Whether you’re looking for an indulgent vegetarian dish or a hearty accompaniment to roast meats, this recipe is sure to impress both family and guests alike.

Nutriscore Rating: 61/100

Prep Time:25 mins

Cook Time:60 mins

Total Time:85 mins

Servings: 6

Ingredients

• 4 medium Carrots
• 4 medium Potatoes
• 2 medium Onions
• 1.5 cups Heavy Cream
• 0.5 cups Whole Milk
• 1.5 cups Grated Gruyère or Cheddar Cheese
• 2 cloves Garlic Cloves
• 2 tablespoons Unsalted Butter
• 0.5 cups Breadcrumbs
• 1 teaspoon Fresh Thyme Leaves
• 0.25 teaspoons Nutmeg
• 1.5 teaspoons Salt
• 0.5 teaspoons Black Pepper

Directions

Step 1

Preheat your oven to 375°F (190°C).

Step 2

Thinly slice the carrots, potatoes, and onions using a sharp knife or a mandoline. Aim for slices about 1/8-inch thick for even cooking.

Step 3

Mince the garlic cloves finely and set aside.

Step 4

In a medium saucepan over medium heat, combine the heavy cream, whole milk, minced garlic, 1 teaspoon of salt, 1/4 teaspoon of black pepper, thyme leaves, and nutmeg. Heat gently, stirring occasionally, until the mixture is warm, but do not let it boil. Remove from heat and set aside.

Step 5

Grease a 9x13-inch baking dish with 1 tablespoon of the butter.

Step 6

Layer the vegetables in the prepared dish: Start with a layer of potatoes, followed by carrots, and then onions. Repeat until all vegetables are used, ending with a potato layer on top.

Step 7

Pour the warm cream mixture evenly over the layered vegetables, allowing it to seep through the layers.

Step 8

Sprinkle 1 cup of grated cheese evenly over the top layer of potatoes.

Step 9

In a small bowl, mix the breadcrumbs with the remaining 0.5 teaspoon of salt, 0.25 teaspoon of black pepper, and the remaining 0.5 cup of cheese. Melt the remaining 1 tablespoon of butter and drizzle it into the breadcrumb mixture, stirring to combine.

Step 10

Sprinkle the breadcrumb mixture evenly over the top of the gratin.

Step 11

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

Step 12

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

Step 13

Let the gratin cool for 5–10 minutes before serving. Garnish with additional fresh thyme leaves, if desired.

Nutrition Facts

Serving size	(2031.8g)

Amount per serving	% Daily Value*
Calories	3296.3

Total Fat 206.8g	0%
Saturated Fat 125.4g	0%
Polyunsaturated Fat 0.4g
Cholesterol 616.6mg	0%
Sodium 5901.2mg	0%
Total Carbohydrate 265.6g	0%
Dietary Fiber 31.3g	0%
Total Sugars 45.0g
Protein 78.6g	0%

Vitamin D 89.7IU	0%
Calcium 1645.1mg	0%
Iron 13.5mg	0%
Potassium 5852.3mg	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: 57.5%

Protein: 9.7%

Carbs: 32.8%