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5 from 4 votes

Easy Homemade Potato Gratin

This Easy Homemade Potato Gratin is the perfect holiday side dish recipe! It's simple to make with only a few ingredients, and it's so creamy!
Course Dinner, Side Dish
Cuisine American, Christmas, Comfort Food, French, Holiday, Thanksgiving
Keyword Easy Homemade Potato Gratin
Prep Time 20 minutes
Cook Time 1 hour 30 minutes
Total Time 1 hour 50 minutes
Servings 8 servings
Calories 289kcal
Author Chrissie (thebusybaker.ca)


  • 3 pounds white potatoes, washed and peeled (peeling optional)
  • 2 medium onions
  • 3 cloves garlic, minced
  • 1 tablespoon chopped fresh sage leaves
  • 1 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1 cup whole milk
  • 1 cup heavy cream (20% or above)
  • 1 beef bouillon cube
  • a good splash of white wine
  • 1 cup freshly grated parmesan (don't use the processed, shelf-stable parmesan for this recipe! Go for the good stuff!)
  • extra chopped fresh sage for garnish


  • Preheat your oven to 400 degrees Fahrenheit and prepare a large 9-inch by 13-inch baking dish by spraying it with cooking spray or greasing with butter.
  • Slice the potatoes and onions into a large bowl using your mandoline slicer. This will ensure you get super thin slices that will bake evenly.
  • Add the garlic, sage, salt and pepper, milk, and cream to the bowl.
  • Crumble the beef bouillon cube over the mixture and add the splash of wine.
  • Use tongs to toss the mixture together until everything is well combined.
  • Pour the mixture into the prepared baking dish and smooth out the top.
  • Cover with aluminum foil (or a lid if your baking dish has an oven-safe lid) and bake for one hour at 400 degrees Fahrenheit.
  • After one hour, remove from the oven and remove the foil or lid.
  • Sprinkle the Parmesan cheese over the top and return to the oven for another 20-30 minutes, or until the cheese is bubbly and begins to brown slightly.
  • Serve immediately.



This recipe can be prepared up to one day in advance and stored in the fridge until ready to bake.


Serving: 1serving | Calories: 289kcal | Carbohydrates: 27g | Protein: 11g | Fat: 16g | Saturated Fat: 10g | Cholesterol: 55mg | Sodium: 645mg | Potassium: 825mg | Fiber: 5g | Sugar: 3g | Vitamin A: 595IU | Vitamin C: 22mg | Calcium: 257mg | Iron: 6mg