Creamy Spinach Gratin: A Rich and Flavorful Side Dish

Elevate your dinner table with the irresistible charm of Spinach Gratin, a decadent side dish that marries the goodness of spinach with creamy cheese and aromatic seasonings. This recipe transforms simple ingredients into a luscious and comforting gratin that’s perfect for any occasion, from casual family dinners to festive gatherings. With its velvety texture and indulgent flavor, this Spinach Gratin is sure to become a beloved favorite in your culinary repertoire. Let’s dive into creating this delightful dish that will leave everyone craving for more.


  • 1 large yellow onion, finely diced
  • 1 clove garlic, minced
  • 1/4 cup all-purpose flour
  • 2 1/2 cups milk
  • 2 tsp kosher salt
  • 1/8 tsp nutmeg
  • 5 (10 oz) boxes spinach, chopped, defrosted
  • 1/2 cup Parmesan cheese, grated
  • 1/2 tsp pepper
  • 1/2 cup Monterey Jack cheese or Gruyere cheese, shredded


  1. Preheat your oven to 375°F (190°C). Grease a baking dish or gratin dish and set it aside.
  2. In a large skillet or saucepan, heat a tablespoon of oil over medium heat. Add the finely diced onion and minced garlic, and sauté until they turn soft and translucent, about 3-4 minutes.
  3. Sprinkle the all-purpose flour over the onion and garlic mixture, stirring constantly to form a roux. Cook the roux for 1-2 minutes, until it becomes golden brown and fragrant.
  4. Gradually pour in the milk, whisking continuously to prevent lumps from forming. Cook the mixture until it thickens and comes to a gentle simmer, about 5-7 minutes.
  5. Season the sauce with kosher salt, nutmeg, and pepper, adjusting the seasoning to taste.
  6. Add the chopped and defrosted spinach to the sauce, stirring well to combine. Allow the ingredients to simmer for an extra 2-3 minutes, allowing the flavors to blend harmoniously.
  7. Remove the skillet from the heat and stir in the grated Parmesan cheese until it’s fully incorporated into the spinach mixture.
  8. Transfer the creamy spinach mixture to the prepared baking dish, spreading it out into an even layer.
  9. Sprinkle the shredded Monterey Jack or Gruyere cheese over the top of the spinach mixture, creating a generous layer of cheese.
  10. Bake the Spinach Gratin in the preheated oven for 20-25 minutes, or until the cheese is golden brown and bubbly.
  11. Once baked to perfection, remove the gratin from the oven and let it cool for a few minutes before serving.
  12. Serve the Creamy Spinach Gratin warm as a delightful side dish alongside roasted meats, grilled fish, or your favorite main course.


With its velvety texture, rich flavors, and cheesy goodness, this Spinach Gratin is a luxurious side dish that promises to elevate any meal to new heights. Whether enjoyed as part of a holiday feast or as a comforting accompaniment to everyday dinners, this gratin is a versatile and satisfying addition to your culinary repertoire. Indulge in the creamy goodness of this spinach-infused delight and treat your taste buds to a symphony of flavors.