Spinach Mushroom Gratin - It’s the perfect side dish for any family gathering, especially a nice holiday meal.
5 from 3 votes

Spinach Mushroom Gratin

A lovely side dish that’s filled with iron-rich dark green spinach, mushrooms, creamy ricotta, cheeses, and all topped off with a crunchy bread crumb topping. This casserole dish is so good!
Course Side Dish
Cuisine American
Keyword gratin, spinach
Prep Time 20 minutes
Cook Time 48 minutes
Total Time 1 hour 8 minutes
Servings 10 servings
Calories 272 kcal
Author Debi


  • 2 bunches green onions chopped
  • 2 tablespoons olive oil
  • 8 ounces mushrooms sliced
  • 20 ounces chopped frozen spinach thawed
  • ½ teaspoon garlic powder
  • 1 teaspoon salt
  • pinch of cayenne pepper
  • ½ teaspoon dried oregano
  • 8 ounces ricotta cheese divided use
  • 3 eggs divided use
  • 4 ounces cream cheese softened
  • 6 ounces Monterey Jack cheese grated, divided use
  • 1 cup Panko
  • ¼ cup unsalted butter melted (½ stick)


  1. Heat the oil in a medium saucepot. Once the oil is hot, sauté the chopped green onions in the oil, until the onions are soft and starting to brown, about 5-7 minutes.
  2. Add the sliced mushrooms, and cook until the mushrooms have released their liquid and the liquid has cooked off, about 7-10 minutes.
  3. Stir in the spinach, and cook 3 minutes, stirring constantly.
  4. Season the mixture with the garlic powder, salt, cayenne pepper, and oregano. Remove from heat.
  5. Stir in 4 ounces of ricotta, 2 eggs, cream cheese, and 1/3 of the grated Monterey Jack cheese.
  6. Grease a 9x9-inch casserole dish with butter or non-stick spray. Spoon the spinach mixture into the prepared casserole dish, and smooth out the top so it isn’t lumpy.
  7. In a separate medium bowl, combine remaining egg with remaining 4 ounces ricotta, and remaining grated Monterey Jack cheese. Spread the cheese mixture over the top of the spinach mixture.
  8. Sprinkle the Panko bread crumbs over the top of the cheese mixture, and drizzle with melted butter.
  9. Bake at 350º F for 30-40 minutes or until casserole is browned, puffed, and bubbling.

Recipe Notes

Makes 8-10 servings

Nutrition Facts
Spinach Mushroom Gratin
Amount Per Serving
Calories 272 Calories from Fat 189
% Daily Value*
Fat 21g32%
Saturated Fat 11g69%
Cholesterol 100mg33%
Sodium 486mg21%
Potassium 358mg10%
Carbohydrates 9g3%
Fiber 2g8%
Sugar 1g1%
Protein 12g24%
Vitamin A 7270IU145%
Vitamin C 4mg5%
Calcium 281mg28%
Iron 2mg11%
* Percent Daily Values are based on a 2000 calorie diet.