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Caramelized Onion Frittata

Caramelized Onion Frittata

A delicious Caramelized Onion Frittata made with simple ingredients that transform into a flavorful dish, perfect for breakfast, lunch, or dinner.
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Prep Time 20 minutes
Cook Time 45 minutes
Total Time 1 hour 5 minutes
Servings: 6 servings servings
Course: Breakfast
Cuisine: American
Calories: 285
Ingredients Method Notes

Ingredients
  

  • 8 to 10 large eggs, room temperature
  • 3 large yellow onions, thinly sliced into half-moons
  • 3 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 1/4 cup heavy cream
  • 1 cup Gruyere cheese, shredded
  • 1 teaspoon fresh thyme, chopped finely
  • Salt and pepper to taste

Method
 

  1. Heat the butter and olive oil in a 10-inch oven-safe skillet over medium-low heat.
  2. Add the sliced onions and a pinch of salt, stirring occasionally, and let them caramelize for 25 to 30 minutes until deep mahogany in color.
  3. While the onions are caramelizing, whisk the eggs in a large bowl with heavy cream, salt, pepper, and fresh thyme until uniform and slightly frothy.
  4. Spread the caramelized onions evenly across the bottom of the skillet and sprinkle half of the shredded Gruyere cheese over the onions.
  5. Pour the egg mixture into the skillet, gently lifting the edges of the onions to allow the eggs to seep underneath.
  6. Sprinkle the remaining cheese on top and let it sit on the stovetop for about two minutes until the edges begin to set.
  7. Preheat the oven to 375°F (190°C) and bake the frittata for 12 to 15 minutes until the center is just barely set with a slight jiggle.
  8. Remove from the oven and let it rest for five minutes before slicing.

Notes

Use an oven-safe skillet, preferably cast iron, for best results. Let eggs come to room temperature before whisking. Store leftovers in the fridge for up to four days.