Caramelized Onion Frittata with 3 More Variations

Elevate your breakfast or brunch menu with this rich and versatile Caramelized Onion Frittata, featuring golden, sweet onions paired with creamy eggs and a Parmesan cheese topping. Perfectly baked to fluffy perfection, this one-skillet dish balances simplicity and sophistication. With three exciting variations—Spinach and Goat Cheese, Mushroom and Swiss, and Tomato and Basil—you can effortlessly customize this recipe to suit any craving. Ready in under an hour with minimal prep time, this frittata is an ideal make-ahead meal that can be enjoyed warm, at room temperature, or even cold. Whether you’re hosting a weekend brunch or preparing a quick weekday meal, this recipe promises to impress with its depth of flavor and versatility.

Nutriscore Rating: 67/100

Prep Time:15 mins

Cook Time:40 mins

Total Time:55 mins

Servings: 4

Ingredients

• 2 tablespoons olive oil
• 1 tablespoon unsalted butter
• 3 large yellow onions, thinly sliced
• 8 large eggs
• 0.25 cup heavy cream
• 0.5 teaspoons salt
• 0.25 teaspoons ground black pepper
• 0.5 cup grated Parmesan cheese
• 2 tablespoons fresh parsley, chopped (optional)

Directions

Step 1

Heat olive oil and butter in a large, ovenproof skillet over medium heat.

Step 2

Add the sliced onions with a pinch of salt and cook, stirring occasionally, for 25-30 minutes until they are deep golden brown and caramelized. Reduce the heat to medium-low if they begin to brown too quickly.

Step 3

Preheat your oven to 375°F (190°C).

Step 4

While the onions cook, whisk the eggs, heavy cream, salt, and pepper together in a large bowl.

Step 5

Once the onions are caramelized, spread them evenly in the skillet and pour the egg mixture over the top. Gently stir to distribute the onions evenly.

Step 6

Sprinkle the grated Parmesan cheese on top.

Step 7

Transfer the skillet to the preheated oven and bake for 12-15 minutes, or until the frittata is set and the center is no longer jiggly.

Step 8

Remove from the oven and let cool slightly. Garnish with fresh parsley if desired, slice into wedges, and serve warm or at room temperature.

Nutrition Facts

Serving size	(998.6g)

Amount per serving	% Daily Value*
Calories	1456.6

Total Fat 112.5g	0%
Saturated Fat 43.4g	0%
Polyunsaturated Fat 2.7g
Cholesterol 1619mg	0%
Sodium 2461.2mg	0%
Total Carbohydrate 50.6g	0%
Dietary Fiber 7.9g	0%
Total Sugars 19.1g
Protein 69.2g	0%

Vitamin D 320IU	0%
Calcium 777.5mg	0%
Iron 9.4mg	0%
Potassium 1244.4mg	0%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 67.9%

Protein: 18.6%

Carbs: 13.6%