Caramelized Onion & Spinach Frittata | Cook for Your Life

Caramelized Onion & Spinach Frittata

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4.1 out of 5 stars (based on 17 reviews)

Clock Icon for Prep Time 20 min prep
Person Icon for Serving Size 6 servings
Carrot Icon for Number of Ingredients Size 7 ingredients

Eggs are a whole food. While the whites have protein, among other things, the rich yolks contain fats, protein, calcium, folate, vitamins A, E, and vitamin B12, a nutrient that isn’t found in plant foods....


  • 1 tablespoon olive oil
  • ½ large onion, chopped
  • 3 cups fresh spinach, stemmed
  • 5 eggs
  • 1 ½ cups cheddar cheese, grated
  • ¼ teaspoon salt, divided
  • ¼ teaspoon pepper
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Nutrition Facts


169 cals


13 g

Saturated Fat

6 g

Polyunsaturated Fat

1 g

Monounsaturated Fat

5 g


2 g


1 g


1 g


10 g


205 mg


  1. Preheat oven to 350° F.  Lightly grease 6 x ½ cup ramekins or muffin tin cups.
  2. Heat oil in a large skillet over medium-high heat.  Add onions with a pinch of salt and cook until onions are brown and soft, stirring frequently to prevent sticking to pan, about 15 minutes.
  3. When onions are cooked, add spinach to skillet and reduce heat to medium.  Heat and stir until wilted, about 3-4 minutes.
  4. In a large bowl, whisk together eggs, cheddar, the spinach-onion mixture, remaining salt, and pepper.
  5. Pour equal amounts of mixture in each ramekin.  Bake for about 20 minutes or until frittata appears golden and a toothpick comes out clean.

Registered Dietitian Approved

Our recipes, articles, and videos are reviewed by our oncology-trained dietitians to ensure that each is backed with scientific evidence and follows the guidelines set by the Oncology Nutrition for Clinical Practice, 2nd Ed., published by the Oncology Nutrition Dietetic Practice Group, a professional interest group of the Academy of Nutrition and Dietetics, and the American Institute for Cancer Research and the American Cancer Society