Description

This Spinach and Cheese Casserole is a comforting, cheesy baked dish perfect as a main course or side. Featuring layers of sautéed onion and garlic, blended with creamy ricotta, mozzarella, and Parmesan cheeses, combined with tender spinach and eggs, this casserole delivers rich flavor and satisfying texture. Topped with buttery breadcrumbs for a golden crust, it’s an easy-to-make vegetarian recipe ideal for weeknights or entertaining.

Ingredients

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Main Ingredients

2 tablespoons butter
1 small yellow onion, finely chopped
3 cloves garlic, minced
2 (10-ounce) packages frozen chopped spinach, thawed and well-drained
4 large eggs
1 cup ricotta cheese
1 cup shredded mozzarella cheese
1/2 cup grated Parmesan cheese
1/2 cup whole milk
1/4 teaspoon ground nutmeg
1/2 teaspoon salt
1/4 teaspoon black pepper

Topping (Optional)

1/2 cup breadcrumbs
1 tablespoon olive oil or melted butter

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Instructions

Prepare the oven and dish: Preheat your oven to 375°F (190°C) and lightly grease a 9×9-inch casserole dish to prevent sticking.
Sauté onion and garlic: In a skillet over medium heat, melt the butter. Add the finely chopped onion and sauté for 3 to 4 minutes until softened. Add the minced garlic and cook for an additional minute. Remove the skillet from heat once fragrant.
Mix the casserole ingredients: In a large mixing bowl, whisk together the eggs, ricotta, mozzarella, Parmesan cheeses, whole milk, ground nutmeg, salt, and black pepper until smooth. Fold in the well-drained chopped spinach and the cooked onion-garlic mixture, ensuring everything is thoroughly combined.
Assemble the casserole: Pour the prepared mixture evenly into the greased casserole dish. If using, toss the breadcrumbs with olive oil or melted butter to coat, then sprinkle this mixture evenly over the top of the casserole.
Bake the casserole: Place the dish in the preheated oven and bake for 35 to 40 minutes, or until the center is set and the top is lightly golden brown.
Cool and serve: Remove the casserole from the oven and let it cool for 5 minutes to set before slicing into portions and serving.

Notes

Squeeze as much moisture as possible from the thawed spinach to avoid a watery casserole.
For extra flavor, you can add cooked bacon or sautéed mushrooms to the spinach mixture.
This casserole reheats well and can be prepared a day in advance for convenience.