Spinach, mushroom and cheddar egg casserole

This spinach, mushroom, and cheddar egg casserole is a hearty dish perfect for breakfast or brunch. Made with sautéed vegetables and baked until golden, it’s ideal for meal prep or a family gathering.

11 Nov 2025
Cook time 25 min
Prep time 10 min

Ingredients:

12 eggs
2.26 cups mushrooms
1/2 cup onion
2.75 cups spinach
3/4 cup cheddar cheese
Spinach, mushroom and cheddar egg casserole

This savory spinach, mushroom, and cheddar egg casserole is a perfect dish for breakfast or brunch. Packed with nutritious vegetables, plenty of protein, and flavorful cheese, it’s not only delicious but also incredibly satisfying. It's an ideal make-ahead recipe for busy mornings or a special weekend treat.

Instructions:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Prepare the Baking Dish: Lightly grease a 9x13-inch baking dish with olive oil or cooking spray to prevent sticking.
3. Sauté the Vegetables:
- In a large skillet, heat a small amount of olive oil over medium heat.
- Add the finely chopped onion and sauté for about 2-3 minutes, until it becomes translucent.
- Add the sliced mushrooms and continue to cook for another 4-5 minutes until the mushrooms are tender and any released moisture has evaporated.
- Toss in the chopped spinach and sauté for an additional 1-2 minutes, until the spinach is wilted. Remove from heat and set aside.
4. Beat the Eggs:
- In a large mixing bowl, crack the 12 eggs and beat them until well mixed.
- Season with a pinch of salt and pepper to taste.
5. Combine Ingredients:
- Fold the sautéed vegetables into the beaten eggs, mixing well to ensure the vegetables are evenly distributed.
- Stir in about half of the shredded cheddar cheese.
6. Assemble the Casserole:
- Pour the egg and vegetable mixture into the prepared baking dish.
- Sprinkle the remaining cheddar cheese evenly over the top.
7. Bake:
- Place the casserole in the preheated oven and bake for about 30-35 minutes, or until the eggs are set and the top is golden brown.
- To check doneness, insert a knife or toothpick into the center; it should come out clean when the casserole is fully cooked.
8. Cool and Serve:
- Remove the casserole from the oven and let it cool for 5-10 minutes before slicing.
- Serve warm and enjoy!

Your spinach, mushroom, and cheddar egg casserole is now ready to be served. This delicious and hearty dish can be enjoyed hot right out of the oven or saved for meal prep throughout the week. It’s a versatile recipe that can easily be adjusted based on your preferences and is sure to be a hit at any breakfast or brunch table.

Spinach, mushroom and cheddar egg casserole FAQ:

What is the baking time for the casserole?

Bake the casserole at 375°F (190°C) for about 30-35 minutes, or until the eggs are set and the top is golden brown.

How can I check if the casserole is done?

To check for doneness, insert a knife or toothpick into the center of the casserole. It should come out clean when fully cooked.

What if I want to make the casserole ahead of time?

You can prepare the casserole the night before, cover it tightly, and store it in the refrigerator. Bake it in the morning, adding a few extra minutes to the baking time if it's chilled.

Can I substitute the cheese or vegetables in this recipe?

Yes, you can substitute cheddar cheese with mozzarella or feta, and you can add or replace vegetables like bell peppers or zucchini based on your preference.

What is the recommended storage method for leftovers?

Store leftover casserole in an airtight container in the refrigerator for up to 3-4 days. Reheat individual portions in the microwave or oven.

Tips:

- Make sure to sauté the mushrooms and onions before adding them to the casserole. This will help to reduce their moisture content and enhance their flavors.

- You can use any type of mushrooms you prefer. Common varieties like button mushrooms, cremini, or portobello work well.

- For a richer flavor, consider using a mix of cheeses such as a combination of cheddar and mozzarella.

- If you prefer a spicier dish, add a pinch of red pepper flakes or diced jalapeños to the vegetable mixture.

- Allow the casserole to cool slightly before cutting into it to allow it to set properly.

Nutrition per serving

4 Servings
Calories 360kcal
Protein 27g
Carbohydrates 6g
Fiber 1.20g
Sugar 2.62g
Fat 24g

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