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Fresh ingredients, hearty, and flavorful, this crustless quiche is the perfect brunch dish that can easily serve a crowd. Easy to prepare ahead of time and very easy to keep and reheat, it’s an excellent low-carb breakfast option!
When I first made this bacon, spinach, and mushroom quiche in 2014, I thought naming it ‘crustless quiche’ was a funny description. Essentially, this crustless quiche is a frittata, but I think saying ‘crustless quiche’ is much catchier.
This bacon, spinach, and mushroom quiche is loaded with smokey bacon, tender baby spinach, and earthy mushrooms. All of the ingredients are evenly distributed throughout the quiche so you get a perfect bite every time! No worries if you don’t like one or two of the ingredients as this is a versatile dish where you are able to swap ingredients out for your favorites. Serve with a hashbrown casserole or blueberry biscuits.
Recipe Tips and Variations
- Swap or add more ingredients. You may choose to add in more vegetables that suit your taste. Some options are red or green bell peppers, broccoli, corn, or sun-dried tomatoes. Try using lion’s mane mushrooms or oyster mushrooms!
- For more protein, swap for liquid egg whites. Read the label on the egg white container to make for an even swap of eggs. Example, if you are replacing 3 eggs for egg whites, it should say on the label how much liquid egg whites equals 3 eggs.
- Turkey bacon is a great swap for the pork if you can’t eat pork. Cook it up the same way! Alternatively, you can add in homemade breakfast sausage too to give this quiche a meatier base. My favorite is million dollar bacon for a sweet and savory vibe.
- After cooking the spinach and mushroom, take care to drain them of excess liquid otherwise you’re going to end up with a very watery quiche!
- Ensure you are using a baking dish that is deep enough to hold all the liquid of the quiche. It also will expand and raise as it cooks so you’ll want to ensure it doesn’t overflow. I like putting my baking dish on top of a baking sheet in the oven to prevent any spills.
- Allow the crustless quiche to sit for 10-15 minutes after baking before slicing into it. The liquids will redistribute and you won’t end up with a watery mess.
Make Ahead Tips
You can also fully assemble the unbaked quiche up to 1 day in advance. Cover the baking dish tightly with plastic wrap and keep in the refrigerator until ready to bake. Allow to sit at room temperature while the oven is preheating, then bake as directed.
Storage and Reheating Instructions
Allow leftover quiche to cool then store in an airtight container in the refrigerator for up to 3 days. To reheat, place into an oven-safe dish and bake for 350 degrees Fahrenheit until warmed through or gently microwave on a microwave-safe plate.
Bacon, Spinach, and Mushroom Crustless Quiche
Equipment
Ingredients
- 6 slices of bacon
- 1 shallot, minced
- 8 ounces (227 g) portobello mushrooms, sliced
- ½ teaspoon dried thyme
- 2 cups (60 g) packed baby spinach
- 1 cup (237 ml) milk, any kind
- ⅓ cup (79 ml) half and half
- 5 large eggs
- ½ cup (50 g) freshly grated Parmesan cheese
- 1 teaspoon Kosher salt
- ½ teaspoon ground black pepper
Instructions
- Preheat oven to 350 °F (177 °C) and spray a 9-inch circular baking dish with cooking spray.
- Cook bacon in a large skillet over medium-high heat until crispy. Remove bacon from the skillet and drain on a paper towel lined plate. Reserve the bacon drippings.6 slices of bacon
- Add shallots to the drippings and sauté for 1 minute over medium-high heat.1 shallot
- Add the mushrooms and thyme and cook until mushrooms have softened, about 5 minutes.8 ounces (227 g) portobello mushrooms, 1/2 teaspoon (½ teaspoon) dried thyme
- Stir in spinach and cook until spinach has wilted, about 2 minute. Remove from heat, let stand for 10 minutes. Drain any excess liquid.2 cups (60 g) packed baby spinach
- In a large bowl, whisk together milk, half and half, eggs, Parmesan cheese, salt, and pepper.1 cup (237 ml) milk, 1/3 cup (79 ml) half and half, 5 large eggs, 1/2 cup (50 g) freshly grated Parmesan cheese, 1 teaspoon Kosher salt, 1/2 teaspoon (½ teaspoon) ground black pepper
- Using a wooden spoon, gently stir in the mushrooms and spinach mixture then pour entire egg mixture into prepared baking dish.
- Break or cut bacon into smaller pieces and sprinkle on top of the egg mixture.
- Bake for 45-55 minutes, or until filling is set. Let stand for 10-15 minutes before serving.
Nutrition
Photographs by Jess Gaertner Creative
Hi Carol – this looks great, I think I’ll try it tomorrow
Hi, my name is Julie! I hope you enjoy this.
Excellent idea for serving the Bible study ladies! It’s my turn to host in my home this week and I needed a new make-ahead breakfast idea. Two of us are gluten-free, one is dairy-free, so I’ll modify to accommodate. I’ll make a gluten-free sweet bread, slice some fruit, coffee and tea, and voila! Breakfast for the ladies! Thank you very much for sharing this recipe.
Hi Julie,
This looks wonderful, and I am going to make this soon. I have two questions: 1- can I use all milk instead of the half and half I would be using 2%? 2- can I use shredded Cheddar instead of Parmesan? The reason I am asking about the cheese is because I know some cheeses can be more oily than others and melt differently. This is my first attempt at making Quiche. Hope to hear from you soon, can’t wait to make this!!
Hi Toni, yes, you can use all milk and you can use 2%. Whatever you like. Yes, you can use cheddar too! Quiches are very versatile and you can’t mess up! Enjoy!
We are on a Keto diet and need to limit dairy. Do you think 1cup heavy whipping cream and the half and half as water would be OK?
I think it’ll be okay to replace the milk and half and half with water.
Hi there! I made this with coconut milk in a muffin tin; fantastic! Thanks so much for sharing!
Yum!
This was amazing. Made it for a brunch and was the hit. And keto to boot.
Reminds me of my family’s ‘frittatas! Great using the oven and less messy – and without burning the cook! Looking forward to your blog!
Thanks Dina! :)
Made it this afternoon. The bacon, mushroom and spinach quiche is still in the oven. I know it is going to be delicious because of the ingredients. I am serving it with a garden salad. My daughter and I are counting the minutes. Thanks for the recipe.
Do you know how many calories are in a slice of this quiche. I am going to a class and we are counting calories and I would like to make this for my breakfasts.
Unfortunately, no. There are many reasons as to why I don’t post nutritional information on my recipes, one of which is that I simply do not have the time to do this. Also, I’m not a registered dietician or nutritionist so for me to give any sort of nutritional information would be incorrect and inaccurate. There are also many differing factors when it comes to nutritional information and since I do not have the knowledge in this, I do not feel comfortable posting this sort of information. If you must have this information, there are many calculators out there (free and paid) that can help you with calculations. A simple Google search would pull up some of these calculators, but again, I’m not endorsing them as I do not know how accurate they may be.
Just had a mini-slice- the recipe is WONDER-FILLED, and will replace ‘old-standbys’! No picture this time, as my kitchen looks like a stormsite !! Friends with health concerns latched onto it, too. Back to visit your site later!!