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Baked cheesy spinach gratin with a spoon lifting some out of a casserole dish
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5 from 5 votes

Spinach Gratin

Spinach Gratin is the ultimate cheesy side dish! Made with vibrant chopped spinach, fragrant garlic and onion, loads of ooey-gooey cheese, and warm spice, this easy casserole is a hit at any gathering!
Prep Time15 mins
Cook Time40 mins
Total Time55 mins
Course: Side Dish
Cuisine: American, French
Servings: 8 servings
Calories: 262kcal


  • 20 oz frozen chopped spinach
  • 3 tbsp salted butter
  • 3 tbsp chopped onion
  • 3 tbsp minced garlic
  • 3 tbsp all purpose flour
  • 1 1/2 cup half and half
  • 1 tsp onion powder
  • 1 tsp Italian seasoning
  • 3/4 tsp garlic powder
  • 1/4 tsp nutmeg
  • a pinch of cayenne optional
  • 4 oz cream cheese room temperature
  • 2/3 cup shredded parmesan cheese separated
  • 3/4 cup shredded Italian blend cheese separated
  • salt and pepper to taste
  • 1/4 cup panko crumbs


  • Preheat the oven to 375 degrees and grease a casserole dish with non-stick cooking spray or butter and set aside.
  • Begin by working with the thawed spinach. Use fresh paper towels to squeeze out all of the excess water until they are as dry as possible.
  • Next add butter to a large pan over medium heat.
  • Once heated add onion and saute until tender (about 3-4 minutes). Then add garlic and saute for about 30 seconds.
  • Stir in flour and cook for about a minute.it will become a thick paste.
  • Whisk in half and half and then add onion powder, Italian seasoning, garlic powder, nutmeg and cayenne. Stir in cream cheese, 1/3 cup of parmesan and 1/4 cup of Italian blend cheese and allow it to completely dissolve into the cream.
  • Finally add in the spinach and stir into the cream sauce. Season with salt and pepper to taste and continue stirring for about 3-4 minutes until spinach is heated through and one with the sauce.
  • Taste one last time, do final seasoning and pour spinach mixture into the greased casserole dish.
  • Sprinkle the top with remaining cheeses and panko crumbs. Bake for 15-20 minutes or until the cheese is melted, golden and bubbly and panko crumbs are golden. Serve warm.


Spinach Gratin can be made up to 48 hours in advance. To do so, prepare the gratin all of the way until baking, then cover and refrigerate until ready to serve. Keep in mind that you may need to add 10-15 minutes of extra baking to account for the refrigeration.
Any leftovers should be stored in an airtight container and refrigerated for up to 5 days. Alternatively, spinach gratin can be frozen for up to 2 months.
To serve it again after freezing, thaw in the fridge overnight and drain the excess liquid. Add a fresh sprinkle of cheese and reheat in the microwave or oven.


Calories: 262kcal | Carbohydrates: 12g | Protein: 12g | Fat: 20g | Saturated Fat: 11g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 5g | Trans Fat: 1g | Cholesterol: 53mg | Sodium: 316mg | Potassium: 369mg | Fiber: 3g | Sugar: 1g | Vitamin A: 8870IU | Vitamin C: 6mg | Calcium: 283mg | Iron: 2mg