Cheese And Onion Quiche | Crust or Crustless Options

Cheese and onion quiche is a great vegetarian addition to a brunch or lunch menu.  The caramelized onion gives this dish lots of flavor!  Feel free to use a pre-made crust or whip up a grain-free, low carb coconut flour pie crust.

A slice of cheese and onion quiche topped with fresh thyme on a white and gray plate.

Cheese and Onion Quiche

Every Christmas morning I make a breakfast dish that we can all enjoy while opening presents and sipping on coffee.

My go to casserole that I make often for lots of family gatherings is this Green Chili Frittata (I need to desperately update this post!).  Everyone likes it and it’s vegetarian, so my daughter can enjoy it too!

This year I made this cheese and onion quiche.  Boy was it delicious, so this quiche will be making an appearance often at our house!

Baked cheese and onion quiche in a tin pan

Crust or no-crust quiche options

There are lots of options when preparing this quiche, including the type of crust to use.

Since I also served this Mixed Fruit Breakfast Casserole and Crustless Spinach Quiche, I kept this cheese and onion quiche low carb by using my Coconut Flour Pie Crust.

If you or your guests are used to tasting and serving grain-free based crusts, then you’ll love the low carb crust. 

If you are slowly transitioning to keto or low carb, then I would stick to the traditional style crust or feel free to make this quiche crustless!

Here are some other pie crust options:

Four photos of step by step instructions on how to make a cheese and onion quiche.

Steps to make a quiche

Let’s make this baby!

First, you want to caramelize the onions to bring out all that delicious flavor! 

The key to caramelizing onions is to be patient when cooking these.  This step can’t be hurried, but you can get them as golden as you would like, but you need to watch them like a hawk!

Next, Prepare the crust or if you are opting for no crust make sure the pie pan is greased generously.

Whisk together the eggs and cream with the herbs and set aside.

To assemble the quiche we are layering half of the cooked onions, then half of the cheese.  Repeat and cover with the egg and cream mixture.

Finally, bake until firm and nicely golden.

What To Serve With Cheese and Onion Quiche

Two plates with cheese and onion quiche on a kitchen table
A slice of cheese and onion quiche topped with fresh thyme on a white and gray plate.

Cheese and Onion Quiche | Crust or Crustless Option

Delicious caramelized onion quiche with sharp cheddar cheese seasoned with thyme. Enjoy this vegetarian pie for brunch, lunch or dinner!
4.80 from 15 votes
Print Pin Rate
Course: Breakfast, Brunch
Cuisine: American
Keyword: breakfast, brunch, vegetarian
Prep Time: 10 minutes
Cook Time: 35 minutes
Total Time: 45 minutes
Servings: 8 servings
Calories: 298kcal
Author: Sandra Shaffer


  • Pie crust
  • 3 onions sliced
  • 1 tablespoon butter
  • 1 tablespoon avocado oil
  • 4 large eggs
  • 1 cup heavy cream
  • 1/2 cup milk
  • 1/2 teaspoon salt
  • 1 tablespoon fresh thyme
  • 1/4 teaspoon pepper
  • pinch of nutmeg
  • 2 cups sharp cheddar cheese


  • Prepare crust in a 10″ tart pan and bake. If preparing crustless, generously grease a glass pie pan and set aside. 
  • In a large skillet add butter and oil and heat on medium-high. Add onion and cook until golden brown (this make take 15-20 minutes).  
  • In a large bowl whisk together eggs, cream, milk, salt & pepper, thyme and nutmeg. 
  • Add half of the onion to the prepared crust or pie plate. Top with half of the cheese and repeat. Top with egg/cream mixture and bake at 350 degrees for 35 minutes or until the quiche is golden and the filling is just set.  
  • Let cool 10 minutes before slicing. 


If the onion gets too try and they still need to be cooked, then add a little water to deglaze the pan and add more moisture. 


Serving: 1g | Calories: 298kcal | Protein: 20g | Fat: 41g | Saturated Fat: 22g | Trans Fat: 1g | Fiber: 1g | Sugar: 4g


Please note that the nutritional information provided are guidelines and may vary based on the brand of products used. For your specific nutritional goals use My Fitness Pal or Verywell Fit recipe calculators. All content within this site is not intended as medical diagnosis or treatment and should not be considered a substitute for professional medical expertise.

This delicious and easy vegetarian cheese and onion quiche is a great addition to a brunch or lunch menu. Caramelized onion gives this dish lots of flavor! #quiche #brunch #pie #savory #vegetarian #lowcarb #keto
Hugs Sandra Signature

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  1. Mmmm those caramelized onions are calling my name! The quiche looks amazing and I’m drooling just thinking about it, what a perfect meal!

  2. I love that there is a gluten-free option. Hubby is on a gluten-free diet so this is perfect for him! YUM!