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slice of crustless quiche on white plate

Spinach Crustless Quiche

Easy Crustless Quiche with spinach and caramelized onions is the perfect brunch recipe.
Course Breakfast
Cuisine American
Keyword egg
Prep Time 30 minutes
Cook Time 45 minutes
Total Time 1 hour 15 minutes
Servings 8 servings
Calories 114kcal
Author Dorothy Kern


  • 1 tablespoon olive oil
  • 1 small yellow onion diced
  • 1 (10 ounce) box frozen chopped spinach thawed
  • 3 large eggs
  • 1 1/2 cups milk
  • 1 cup mozzarella cheese shredded
  • 1/4 teaspoon salt
  • 1/4 teaspoon ground pepper


  • Place a medium sized frying pan over medium-low heat. Add olive oil and swirl in the pan. Add the onions and cook, stirring often, until they’re brown and caramelized, about 15-20 minutes. Remove from heat to cool.
  • Preheat oven to 350°F. Spray a quiche pan (or 9-inch pie pan or square baking dish) with nonstick cooking spray.
  • Remove spinach from box and place in several layers of paper towels or a clean kitchen towel. Squeeze out all the water from the spinach. Remove towel.
  • Whisk eggs and milk until frothy. Stir in the spinach, onions, cheese, salt, and pepper.
  • Pour into prepared pan. Bake 35-45 minutes, or until it’s browned and no longer jiggly. (If you have an instant thermometer, it should read about 170°F internal temperature when it’s done.)
  • Cool slightly then serve. Store leftovers in refrigerator. Best eaten the day it’s made.


Serving: 1serving | Calories: 114kcal | Carbohydrates: 3g | Protein: 6g | Fat: 7g | Saturated Fat: 3g | Cholesterol: 77mg | Sodium: 204mg | Potassium: 113mg | Sugar: 3g | Vitamin A: 275IU | Vitamin C: 1mg | Calcium: 135mg | Iron: 0.4mg