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quiche made with spinach in a white dish.
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4.82 from 11 votes

Spinach Crustless Quiche Recipe

Easy Crustless Quiche with spinach and caramelized onions is the perfect brunch recipe.
Prep Time30 minutes
Cook Time45 minutes
Total Time1 hour 15 minutes
Course: Breakfast
Cuisine: American
Servings: 8 servings
Calories: 114kcal
Author: Dorothy Kern
Cost: $10


  • 1 tablespoon olive oil
  • 1 small yellow onion diced
  • 1 (10 ounce) box frozen chopped spinach thawed
  • 3 large eggs
  • 1 ½ cups milk
  • 1 cup mozzarella cheese shredded
  • ¼ teaspoon salt
  • ¼ 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.



  • Be sure to remove all the excess water from the spinach when squeezing it.
  • Use any cheese you like!
  • Quiche is done when it's lightly golden, no longer wet, and jiggles when tapped (instead of rolling like waves).


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