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Dreamy Creamy Cheddar Potato Gratin

Tender Yukon Golds bake in a luscious cheddar cream sauce until bubbly and golden.

Janelle

By Janelle

Updated: January 18, 2026

Why I Love This Recipe

Potato gratin, at its heart, is simple comfort food elevated. This version leans into the rich, nutty flavor of sharp cheddar, transforming humble potatoes into a decadent side dish or even a satisfying vegetarian main course. The beauty of this recipe lies in its forgiving nature; a touch more cream here, a little less thyme there, and you'll still end up with a dish that's guaranteed to please. It’s a dish that speaks of cozy evenings and shared meals, a testament to the fact that sometimes the simplest ingredients, when treated with care, create the most memorable experiences.

  • •Unctuous Texture - Thinly sliced potatoes melt into the creamy sauce, creating a luxuriously smooth texture.
  • •Sharp Cheddar Bite - The distinct flavor of sharp cheddar cuts through the richness of the cream, preventing it from being overly heavy.
  • •Aromatic Infusion - Fresh thyme and garlic infuse the cream, adding subtle herbal and savory notes that complement the potatoes and cheese.
  • •Effortless Elegance - While appearing sophisticated, this gratin requires minimal active cooking time, making it perfect for weeknights or special occasions.
  • •Golden Brown Crust - The top layer of cheese bubbles and browns in the oven, adding a delightful textural contrast to the creamy interior.

Ingredients You'll Need

Here's what you'll need – nothing too fancy, just good ingredients that work together beautifully.

  • 2 lbs Yukon Gold potatoes (peeled and thinly sliced)
  • 2 cups Heavy cream
  • 1 cup Whole milk
  • 8 oz Sharp cheddar cheese (grated)
  • 2 cloves Garlic (minced)
  • 2 tsp Fresh thyme (chopped)
  • 1/4 tsp Nutmeg (freshly grated)
  • 1 tsp Salt (or to taste)
  • 1/2 tsp Black pepper (freshly ground)
  • 2 tbsp Butter (for greasing the dish)

Step-by-Step Instructions

  1. 1

    Preheat your oven to 375°F (190°C). This ensures the gratin cooks evenly and the cheese melts properly.

    ~2 min

  2. 2

    Grease a 9x13 inch baking dish with butter. This prevents the potatoes from sticking and adds a subtle richness to the edges of the gratin.

    ~3 min

  3. 3

    In a large saucepan, combine the heavy cream, whole milk, minced garlic, and chopped thyme. Heating the cream mixture first helps to infuse the flavors and create a smooth, consistent sauce.

    ~5 min

  4. 4

    Bring the cream mixture to a simmer over medium heat, then immediately reduce the heat to low. Simmering gently allows the flavors to meld without scorching the cream.

    ~3 min

  5. 5

    Stir in half of the grated cheddar cheese (about 4 oz), nutmeg, salt, and pepper. Stir until the cheese is melted and the sauce is smooth and creamy. This creates the base for the gratin and ensures a cheesy flavor throughout.

    ~3 min

  6. 6

    Remove the saucepan from the heat. This prevents the sauce from thickening too much before you assemble the gratin.

    ~1 min

  7. 7

    Arrange a layer of potato slices in the prepared baking dish, overlapping slightly. This helps the potatoes cook evenly and creates a visually appealing presentation.

    ~5 min

  8. 8

    Pour a third of the cheese sauce over the potato layer. Ensure that all the potatoes are coated in the creamy sauce.

    ~2 min

  9. 9

    Repeat the layering process twice more, ending with a layer of cheese sauce. This ensures the potatoes are evenly distributed and saturated with flavor.

    ~3 min

  10. 10

    Sprinkle the remaining cheddar cheese (the other 4 oz) evenly over the top of the gratin. This creates a beautiful golden crust as it bakes.

    ~1 min

  11. 11

    Bake in the preheated oven for 45-50 minutes, or until the potatoes are tender and the top is golden brown and bubbly. A knife inserted into the center should meet little resistance.

    ~48 min

  12. 12

    Let the gratin rest for 10 minutes before serving. This allows the sauce to thicken slightly and makes it easier to slice and serve.

    ~10 min

How Do I Know It's Ready?

The potatoes should be easily pierced with a fork or knife. The top should be golden brown and bubbly, and the sauce should be thickened.

Frequently Asked Questions

Yes, you can assemble the gratin ahead of time and store it in the refrigerator for up to 24 hours. Add about 10-15 minutes to the baking time.

Final Thoughts

I hope you enjoy making this Dreamy Creamy Cheddar Potato Gratin as much as I do! It's a wonderful dish that's sure to become a favorite in your kitchen. If you try this recipe, I'd love to hear how it turned out – feel free to share your experience and any variations you tried!