Spinach Mushroom Frittata

A Spinach Mushroom Frittata is a wholesome, protein-rich dish that is perfect for breakfast, brunch, lunch, or even a light dinner. Made with fluffy eggs, tender mushrooms, fresh spinach, savory cheese, and aromatic herbs, this classic oven-finished egg dish is both satisfying and versatile. Frittatas are easy to customize, making them an excellent way to use fresh vegetables and pantry staples. Whether served warm from the oven or enjoyed cold the next day, this Spinach Mushroom Frittata delivers delicious flavor and nutrition in every bite.

Prep Time

15 minutes

Cook Time

25 minutes

Total Time

40 minutes

Servings

6 servings

Ingredients

Base Ingredients

10 large eggs

½ cup half-and-half or whole milk

1½ cups shredded Gruyère, Swiss, or Cheddar cheese

Vegetables

10 ounces cremini or baby bella mushrooms, sliced

3 cups fresh baby spinach, roughly chopped

1 small onion, finely diced

2 cloves garlic, minced

Pantry Staples & Seasonings

2 tablespoons salted butter

2 tablespoons olive oil

1 teaspoon sea salt

½ teaspoon freshly ground black pepper

½ teaspoon dried oregano

½ teaspoon dried thyme

½ teaspoon paprika

Pinch of red pepper flakes (optional)

Instructions

Preheat the Oven

Preheat your oven to 375°F (190°C).

Prepare the Egg Mixture

In a large mixing bowl, whisk together the eggs, half-and-half, cheese, salt, black pepper, oregano, thyme, paprika, and red pepper flakes until smooth and well combined.

Cook the Vegetables

Heat the olive oil and butter in a large oven-safe skillet over medium heat.

Add the diced onion and cook for 3 to 4 minutes until softened.

Stir in the garlic and cook for 30 seconds until fragrant.

Add the sliced mushrooms and sauté for 6 to 8 minutes until golden brown and their moisture has evaporated.

Add the spinach and cook for 1 to 2 minutes until wilted.

Combine and Cook

Spread the vegetables evenly across the skillet.

Pour the egg mixture over the vegetables and gently stir once to distribute ingredients evenly.

Cook on the stovetop for 3 to 4 minutes until the edges begin to set.

Bake the Frittata

Transfer the skillet to the preheated oven.

Bake for 15 to 18 minutes or until the center is fully set and the top is lightly golden.

Cool and Serve

Allow the frittata to rest for 5 minutes before slicing.

Serve warm with a fresh salad, roasted potatoes, or crusty bread.

Tips

Use an oven-safe skillet

A cast-iron skillet works perfectly for frittatas.

Cook mushrooms thoroughly

Removing excess moisture prevents a watery frittata.

Don’t overbake

Overcooking can make the eggs rubbery.

Whisk eggs well

This creates a lighter and fluffier texture.

Use freshly shredded cheese

Fresh cheese melts more smoothly than packaged shredded cheese.

Let it rest before slicing

Resting helps the frittata hold its shape.

Season properly

Eggs require adequate seasoning for the best flavor.

Add vegetables evenly

This ensures every slice contains a balanced filling.

Use room-temperature eggs

They blend more easily and cook evenly.

Store leftovers properly

Refrigerate in an airtight container for up to 4 days.

Variations

Mediterranean Frittata

Add sun-dried tomatoes, feta cheese, and olives.

Bacon Mushroom Frittata

Mix in cooked crispy bacon for extra flavor.

Ham and Swiss Version

Add diced ham and Swiss cheese.

Low-Carb Keto Frittata

Use heavy cream and extra cheese while keeping vegetables moderate.

Vegetarian Garden Frittata

Add zucchini, bell peppers, and asparagus.

Italian Herb Frittata

Include basil, parsley, and mozzarella cheese.

Spicy Southwest Frittata

Add jalapeños, pepper jack cheese, and smoked paprika.

Goat Cheese Version

Replace half the shredded cheese with creamy goat cheese.

Mushroom Lover’s Frittata

Use a mixture of cremini, shiitake, and oyster mushrooms.

Dairy-Free Version

Skip the cheese and use unsweetened dairy-free milk.

Frequently Asked Questions

What is the difference between a frittata and an omelet?

A frittata is cooked slowly and finished in the oven, while an omelet is folded around fillings and cooked entirely on the stovetop.

Can I use frozen spinach?

Yes. Thaw it completely and squeeze out excess moisture before using.

Can I make this ahead of time?

Absolutely. It reheats beautifully and is great for meal prep.

How do I know when the frittata is done?

The center should be set and no longer jiggle when the skillet is gently shaken.

Can I freeze a frittata?

Yes. Wrap slices individually and freeze for up to 2 months.

What cheese works best?

Gruyère, Swiss, Cheddar, mozzarella, and feta are all excellent choices.

Can I make it without dairy?

Yes. Use dairy-free milk and omit the cheese.

Why is my frittata watery?

Vegetables that contain excess moisture, especially mushrooms and spinach, may not have been cooked long enough.

Can I add meat?

Certainly. Bacon, sausage, ham, or cooked chicken are great additions.

How should leftovers be reheated?

Warm slices in the oven, microwave, or air fryer until heated through.

Nutrition

Approximate values per serving:

Calories: 285

Protein: 19g

Carbohydrates: 5g

Fat: 21g

Saturated Fat: 9g

Cholesterol: 335mg

Sodium: 540mg

Fiber: 1g

Sugar: 2g

Calcium: 260mg

Iron: 2mg

Conclusion

Spinach Mushroom Frittata is a simple yet elegant dish that brings together fluffy eggs, earthy mushrooms, tender spinach, and rich melted cheese in one satisfying meal. Easy enough for a weekday breakfast yet impressive enough for brunch gatherings, this versatile recipe can be customized with countless ingredients to suit any taste. With its balance of protein, vegetables, and savory flavor, this frittata is a delicious way to enjoy a wholesome homemade meal any time of day.