Easy Mushroom & Swiss Chard Frittata

Breakfast

March 21, 2026

Looking for a meal that’s effortlessly elegant, packed with flavor, and perfect for any time of day? Meet your new favorite recipe: this gorgeous Mushroom and Swiss Chard Frittata! It’s a celebration of earthy cremini mushrooms, vibrant greens, and the salty bite of Kalamata olives and Parmesan. Whether you need a quick weeknight dinner, a show-stopping brunch centerpiece, or a healthy meal-prep option, this frittata delivers. It comes together in one skillet and is on the table in just 30 minutes. Let’s get cooking!

Ingredients

• PREP: 25 minutes | STAND: 5 minutes | MAKES 4 servings
• 1 cup / 100g sliced fresh cremini mushrooms
• 1 tablespoon / 15ml olive oil
• 2 cups / 120g coarsely shredded Swiss chard or fresh spinach
• 1 large shallot, thinly sliced
• 4 large eggs
• 2 large egg whites
• 2 teaspoons snipped fresh rosemary or 1⁄2 teaspoon dried rosemary, crushed
• 1⁄4 teaspoon ground black pepper
• 1⁄8 teaspoon salt
• 1⁄4 cup / 35g thinly sliced pitted kalamata olives
• 1⁄3 cup / 30g shredded Parmesan cheese

Instructions

1. Preheat your broiler. In a medium broiler-proof, nonstick skillet, heat the olive oil over medium heat. Add the mushrooms and cook for 3 minutes, stirring occasionally. Add the Swiss chard and shallot, and continue to cook for about 5 minutes, or until the vegetables are tender.
2. While the vegetables cook, whisk together the eggs, egg whites, rosemary, black pepper, and salt in a medium bowl.
3. Pour the egg mixture over the cooked vegetables in the skillet. Continue to cook over medium heat. As the eggs begin to set, run a spatula around the edge of the skillet, lifting the cooked portion to allow the uncooked egg to flow underneath. Cook until the frittata is nearly set and the surface is still slightly moist.
4. Sprinkle the top evenly with the Kalamata olives and Parmesan cheese.
5. Transfer the skillet to the oven and broil about 4 inches from the heat for 2 minutes, or until the top is golden brown and the center is fully set.
6. Carefully remove the skillet from the broiler and let it stand for 5 minutes before slicing and serving.

Nutritional Information

• Per Serving
• Calories: 165
• Total Fat: 11g (3g Saturated Fat)
• Cholesterol: 216mg
• Sodium: 416mg
• Carbohydrates: 4g
• Fiber: 1g
• Protein: 12g

Pro Tips

• Substitute 1 1/4 cups of refrigerated or frozen egg product (thawed) for the whole eggs and egg whites for a quicker prep.
• Ensure your skillet is oven-safe! A well-seasoned 10-inch cast-iron skillet is a perfect choice as it goes seamlessly from stovetop to broiler.
• Feel free to swap the Parmesan for feta, goat cheese, or Gruyère for a different flavor profile. Add crumbly cheeses at the end with the olives.
• This frittata is delicious warm or at room temperature. Store leftovers in an airtight container in the fridge for up to 3 days, making it perfect for meal prep.

FAQ

Q: Can I make this mushroom frittata vegan
A: Yes, you can adapt this recipe to be vegan. Replace the eggs and egg whites with a liquid vegan egg substitute according to package directions. For the cheese, use your favorite dairy-free shredded Parmesan alternative. The rest of the ingredients are naturally plant-based.

Q: How can I add more protein to this vegetarian frittata
A: To boost the protein, consider adding 1/2 cup of cooked chickpeas or white beans along with the vegetables. You can also swap the Parmesan for a higher-protein cheese like cottage cheese (blended into the eggs) or serve the frittata with a side of vegetarian sausage.

Q: What other vegetables can I use instead of Swiss chard
A: This frittata is very versatile! You can easily substitute the Swiss chard with an equal amount of other greens like spinach or kale. Other great vegetable additions include diced bell peppers, zucchini, or asparagus. Just be sure to cook any harder vegetables until tender before adding the eggs.

Q: How do I store and reheat this frittata for meal prep
A: This frittata is perfect for meal prep. Once cooled, store individual slices or the whole frittata in an airtight container in the refrigerator for up to 3 days. You can enjoy it cold, at room temperature, or reheat individual slices in the microwave for 30-60 seconds until warmed through.

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