Classic Creamy Potato Gratin for Easy Dinner Sides
Experience the ultimate comfort in every bite of this Classic Creamy Potato Gratin. After making this many times, I’ve discovered the secret to the perfect golden crust. Keep reading for my best tips. If you love recipes like this, you’ll also enjoy Refreshing Watermelon Rose Cooler and Creamy Baked Lemon Butter Chicken.
Why This Classic Creamy Potato Gratin for Easy Dinner Sides Is Pure Comfort
- Crispy golden crust for a satisfying crunch
- Creamy, tender potatoes that melt in your mouth
- Easy to make ahead for busy weeknight dinners
- Better than takeout and pays for itself in no time
What You'll Need for Classic Creamy Potato Gratin for Easy Dinner Sides
Choosing the right ingredients makes a big difference, but this recipe is forgiving enough to work with what you have.
- 2 lbs (900g) russet potatoes
- 1 cup (240ml) heavy cream
- 1 cup (240ml) whole milk
- 1 tbsp (15ml) Dijon mustard
- 1 tsp (5ml) salt
- 1/2 tsp (2.5ml) black pepper
- 2 cloves garlic, minced
- 2 cups (200g) grated Gruyère cheese
- Salt and pepper to taste
- Garlic powder (optional)
- Nutmeg (optional)
- Optional: Fresh parsley, chopped
- Optional: Crispy bacon bits
- Optional: Sour cream or Greek yogurt
📝 Ingredient Notes
- Potatoes: Yukon Gold or red potatoes can also be used.
🛒 Tools & Equipment I Recommend
- Mandoline slicer — Ensures even slices for perfectly layered gratin → See on Amazon
- Food processor — Saves time and effort in shredding cheese → See on Amazon
How to Make Classic Creamy Potato Gratin for Easy Dinner Sides
- Prepare the potatoes: Peel and slice potatoes thinly using a mandoline slicer. Soak in cold water for 10 minutes to remove excess starch.
- Make the cream sauce: In a bowl, whisk together heavy cream, milk, mustard, salt, pepper, and garlic. Set aside.
- Assemble the gratin: Preheat oven to 375°F (190°C). In a 9×13-inch (23×33-cm) baking dish, spread a thin layer of cream sauce. Arrange a layer of potatoes, followed by a generous sprinkle of cheese. Repeat with remaining potatoes and cheese, ending with cheese on top.
- Bake: Cover the dish with foil and bake for 45 minutes. Remove foil, increase heat to 425°F (220°C), and bake for another 20-25 minutes, or until golden and bubbly.
- Rest and serve: Let stand for 10 minutes before serving. Garnish with fresh parsley and serve with your favorite main dish.
Cook's Tips for Perfect Classic Creamy Potato Gratin for Easy Dinner Sides
- Tip: Use a mandoline slicer for even potato slices that cook evenly.
- Common mistake and fix: Don't overcook the potatoes. If they're too soft, they'll turn mushy. To fix, add more cheese and bake until crispy.
- Tip: For a richer flavor, use a mix of cheeses like Gruyère and Parmesan.
- Tip: Make ahead: Assemble the gratin, but don't bake. Cover and refrigerate for up to 24 hours. Bake as directed, adding 10-15 minutes to cooking time.
Storing & Reheating Classic Creamy Potato Gratin for Easy Dinner Sides
Short-Term Storage
Store in an airtight container in the fridge. Store leftovers in an airtight container in the fridge for up to 4 days. Make-ahead tip: Yes, see pro tips.
Freezing Classic Creamy Potato Gratin for Easy Dinner Sides
Freeze individual portions for up to 2 months. Thaw overnight in the fridge before reheating.
How to Reheat Without Drying It Out
Oven: Reheat in a 350°F (180°C) oven for 15-20 minutes, or until heated through. Microwave: Reheat in the microwave for 2-3 minutes, or until heated through. Top with a little cream or milk to keep it moist.
Recipe Notes
- Chef tip: For a healthier version, use half-and-half or whole milk instead of heavy cream.
- Best substitution: Substitute the cheese with a mix of cheddar and mozzarella for a milder flavor.
- Make-ahead: See storage notes for make-ahead tips.
- Scaling: This recipe can be easily doubled or halved to serve more or fewer people.
- Troubleshooting: If the top is browning too quickly, tent the dish with foil.
Want to level up this recipe?
Cast iron skillet — Even heat distribution for perfect potato gratin → Check price on Amazon
Classic Creamy Potato Gratin for Easy Dinner Sides
Ingredients
Main Ingredients
- 2 lbs (900g) russet potatoes
- 1 cup (240ml) heavy cream
- 1 cup (240ml) whole milk
- 1 tbsp (15ml) Dijon mustard
- 1 tsp (5ml) salt
- 1/2 tsp (2.5ml) black pepper
- 2 cloves garlic, minced
- 2 cups (200g) grated Gruyère cheese
Seasonings
- Salt and pepper to taste
- Garlic powder (optional)
- Nutmeg (optional)
Optional Toppings
- Fresh parsley, chopped
- Crispy bacon bits
- Sour cream or Greek yogurt
Instructions
- Prepare the potatoes: Peel and slice potatoes thinly using a mandoline slicer. Soak in cold water for 10 minutes to remove excess starch.
- Make the cream sauce: In a bowl, whisk together heavy cream, milk, mustard, salt, pepper, and garlic. Set aside.
- Assemble the gratin: Preheat oven to 375°F (190°C). In a 9×13-inch (23×33-cm) baking dish, spread a thin layer of cream sauce. Arrange a layer of potatoes, followed by a generous sprinkle of cheese. Repeat with remaining potatoes and cheese, ending with cheese on top.
- Bake: Cover the dish with foil and bake for 45 minutes. Remove foil, increase heat to 425°F (220°C), and bake for another 20-25 minutes, or until golden and bubbly.
- Rest and serve: Let stand for 10 minutes before serving. Garnish with fresh parsley and serve with your favorite main dish.
Notes
- Chef tip: For a healthier version, use half-and-half or whole milk instead of heavy cream.
- Best substitution: Substitute the cheese with a mix of cheddar and mozzarella for a milder flavor.
- Make-ahead: See storage notes for make-ahead tips.
- Scaling: This recipe can be easily doubled or halved to serve more or fewer people.
- Troubleshooting: If the top is browning too quickly, tent the dish with foil.
Storage
- Fridge: Store leftovers in an airtight container in the fridge for up to 4 days.
- Freezer: Freeze individual portions for up to 2 months. Thaw overnight in the fridge before reheating.
- Oven reheat: Reheat in a 350°F (180°C) oven for 15-20 minutes, or until heated through.
- Microwave reheat: Reheat in the microwave for 2-3 minutes, or until heated through. Top with a little cream or milk to keep it moist.
- Make ahead: Yes, see pro tips.
Nutrition Per Serving
- Calories: 350
- Protein: 10g
- Fat: 20g
- Carbs: 35g
- Fiber: 3g
- Sugar: 3g
- Sodium: 350mg
- Cholesterol: 70mg
- Sat. Fat: 12g
Nutritional values are estimates only. Actual values may vary by brand and portion size.
Classic Creamy Potato Gratin for Easy Dinner Sides FAQs
Yes, see storage notes for make-ahead tips.
Overcooking can make the gratin dry. To fix, add more cream or milk and bake until creamy.
Yes, freeze individual portions for up to 2 months. Thaw overnight in the fridge before reheating.
No, the air fryer is not suitable for this recipe as it requires oven baking for even cooking.
Reheat in a 350°F (180°C) oven for 15-20 minutes, or until heated through. Top with a little cream or milk to keep it moist.
A Warm Final Note
I can’t wait for you to try Classic Creamy Potato Gratin for Easy Dinner Sides and see how effortlessly it comes together. When you make it, pop back here and leave a rating or share how it turned out — I love hearing from you!
