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Spinach Mushroom Frittata

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4.92 from 272 votes
By Carine - - 3 Comments

This easy spinach mushroom frittata recipe is the best creamy, custardy frittata recipe stuffed with fresh spinach, mushrooms, and three kinds of cheese! The perfect family breakfast, brunch, or light dinner with only 3.5 grams of net carbs per serving!

Yes, you can eat lots of vegetables on your keto journey as long as you focus on low-carb vegetables. The keto diet is not only about bacon and butter! Actually, you can have delicious keto vegetarian dishes like this keto vegetarian frittata in your weekly meal plan rotation to boost your body with vitamins and minerals.

You’ll love this keto spinach mushrooms frittata recipe as a keto breakfast! It has all you need to start the day: fat, protein, vitamins without the unnecessary carbs. It’s a great swap to regular fried eggs on your keto journey and perfects to meal prep your keto week!

What’s a Vegetable Frittata?

Frittata recipes are the easiest and convenient, healthy breakfasts. They are very similar to breakfast casseroles. It is a one-pan dish baked in the oven and perfect to feed a crowd in less than 30 minutes.

You can create a range of vegetarian frittata recipes using different vegetables anytime. Here I am going to share the best vegetarian frittata! This spinach mushroom frittata recipe is the most flavorsome breakfast frittata for vegetarians! It’s packed with not only vegetables, and it is also a high protein breakfast to keep you full until lunchtime.

Let me show you how you can make easy frittata vegetarian in a few simple steps.

How to make spinach frittata?

To make a fluffy, custardy spinach and egg frittata, you first need to stir-fry the vegetables in olive oil. This not only adds flavor but also removes any vegetable juice from the spinach and mushrooms that could make your frittata runny.

Preparing the ingredients

First, set up all your ingredients on the kitchen countertop. You will need:

  • Large eggs – I am using free-range eggs.
  • Heavy cream – or unsweetened almond milk for a dairy-free option.
  • Salt
  • Pepper
  • Shredded parmesan
  • Dried oregano – or fresh herbs of choice like finely chopped Italian parsley.
  • Fresh spinach – I am using fresh baby spinach leaves. The small leaves are easier to cook. If you are using fresh large spinach leaves, simply chop them before cooking.
  • Onion
  • Olive oil or butter to stir fry the vegetables.
  • Red pepper – this is optional, and if you simply want to make a mushroom spinach frittata baked in the oven, remove it from the recipe.
  • Feta cheese – I am using goat feta cheese, but any soft goat cheese works well

Preparing the egg mixture

First prepare the egg mixture for your spinach and feta frittata.

In a large bowl, whisk all the egg batter ingredients until well combined. Don’t over whisk; just whisk as for an omelette batter. Set aside while you are preparing the vegetables for your spinach mushroom frittata keto recipe.

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Stir fry the vegetables

Next, heat olive oil over medium in a large non-stick saucepan or cast-iron skillet. I really mean large pan because fresh spinach needs a lot of room even if it shrinks down when cooked.

Start by sautéing onions and garlic, then stir fry the sliced button mushrooms and diced red bell pepper if used. If you don’t like red bell pepper, simply remove it from the recipe.

Stir fry the vegetables for 2 minutes until mushrooms release their juice and season with salt and pepper. Next, add the baby spinach and cook with a lid on the pan. This will help the spinach shrink down and cook fast. Remove lid every 30 seconds, give a good stir and keep cooking until the spinach is wilted and the roasted vegetables released their juices.

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Assembling the dish

Transfer the cooked vegetables using a slotted spoon onto a 10-inch round baking dish or a 9-inch x 9-inch square baking dish. The slotted spoon drains the vegetables from their juice and prevents a runny frittata.

Next, pour the egg mixture on top of the vegetable. Finally, sprinkle the shredded cheddar evenly over the dish. To make a mushroom and spinach frittata with goat cheese, as seen in my picture, crumble goat cheese all over the pan.

Goat cheese is a keto-friendly cheese, and it adds the most delicious creamy texture and flavor to your spinach mushroom frittata recipe.

How to Make Keto Vegetarian Frittata Recipe?

Easy 30-minute baked frittata recipe

The best part about this keto spinach mushroom frittata recipe is:

  • Ready in 30 minutes of preparation.
  • Feeds the entire family with a protein-packed breakfast full of healthy greens.
  • Stores and freezes well to meal prep a week of breakfast. You can thaw this spinach mushroom goat cheese frittata recipe the day before in the fridge and rewarm in a preheated oven at 250F (120C) until warm or microwave.

Keep in mind that if you use a microwave, it makes the frittata texture very chewy and runny, especially if it had been frozen before.

So, I highly recommend you rewarm leftovers in the oven.

Keto Vegetarian Frittata Recipe

Can I use frozen spinach in this frittata recipe?

You can use frozen spinach to make this keto frittata spinach recipe. Obviously, they will release a lot of liquid in the pan, and you will have to cook the vegetable a little bit longer to evaporate the extra liquid.

Another option is to thaw the frozen spinach for a few hours before preparing this spinach feta frittata keto recipe.

Keto spinach frittata with feta cheese

Is feta keto friendly ?

Yes, feta is a keto-friendly cheese with zero carbs per 100 grams and as much as 8 grams of fat to help you reach your macro.

Can I swap the mushrooms for something else?

Mushrooms are great keto low-carb vegetables packed with protein. However, if you don’t like mushrooms and don’t mind adding meat to this recipe, replace it with the same amount of bacon pieces. A spinach and bacon frittata taste amazing, too, with goat cheese on top.

How to serve frittata?

This frittata is even better served with a dollop of sour cream on top. It adds a tangy, fresh, and creamy touch to the dish.

Made this keto frittata with fresh spinach recipe yet? Share a picture with us on my Facebook support group, where we connect and answer all our questions to thrive on keto!

xoxo Carine

Recipe Card

Spinach Mushroom Frittata

spinach frittata feta
3.4gNet Carbs
4.92 from 272 votes
Prep Time: 15 mins
Cook Time: 18 mins
Total Time: 33 mins
Net Carbs 3.4g
Fat 25.7g
Protein 18.2g
Calories 320.5kcal
Author: Carine Claudepierre
6 people
Learn how to make an easy spinach and mushroom frittata with goat cheese in the oven. The perfect keto vegetarian breakfast for any day of the week.

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Net Carbs
4.92 from 272 votes
Review Print



  • 2 tablespoons Extra Virgin Olive Oil or butter
  • ¼ cup Onion , diced
  • 1 cup button mushrooms , sliced or diced bacon if not vegetarian
  • ¼ cup Red Capsicum , seeded, diced
  • 6 cups Fresh Spinach Leaves ,cleaned, feet removed, roughly chopped (300g,10.5 oz)or or 10 oz frozen spinach

Egg batter

  • 8 large Egg
  • cup Heavy Cream
  • cup Shredded Parmesan
  • ¼ teaspoon Garlic Powder
  • ¼ teaspoon salt
  • 1 teaspoon Dried oregano – optional
  • teaspoon Ground pepper

Cheese Toppings

  • 1 cup Shredded Cheddar , shredded emmental
  • cup Goat cheese crumbled in pieces
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  • Preheat oven to 200°C (400°F). Spray olive oil into a 1.5-liter glass or ceramic baking dish. Set aside.

Prepare the egg batter

  • In a large mixing bowl, whisk together eggs, heavy cream, shredded parmesan, garlic powder, salt, dried oregano, salt, and pepper. I used a hand whisk, and this process took me 1 minute, don't over whisk. Simply whisk enough to break eggs and combine with milk and spices. Set aside in the fridge.

Saute the vegetables

  • Under medium heat, warm olive oil into a large non-stick pan. 
  • Stir in the diced onion and cook for 1- 2 minutes until fragrant and transparent.
  • Stir in diced capsicum and sliced mushrooms. Sauté the vegetables for 2-3 minutes until fragrant and mushrooms have released their water.
  • Pile the chopped spinach in the pan, cover with a lid, reduce to low heat, and cook, stirring every 30 seconds until the spinach leaves wilt. It will significantly decrease in volume as spinach leaves will release their water. 
  • Remove lid, stir and cook for an extra 1-2 minutes to evaporate the water from the spinach. You don't want to add water to the frittata, or it won't firm up in the oven. Note: If your pan is too small, you can add the spinach in two parts, repeat the cooking process two times. 
  • Use a slotted spoon to transfer the sautéed vegetables into a 9-inch x 9-inch baking dish. This avoids transferring any remaining vegetable juice from the pan.
  • Pour the previous egg mixture on top of the cooked vegetables.
  • Add shredded cheddar and crumble some goat cheese all over the top of the pan
  • Bake in the oven's middle rack for 30-35 minutes or until the filling is set. Check if cooked through by cutting a tiny bit in the center of the frittata. If not set, bake longer.
  • Serve hot with a green salad on the side.


  • Store in the fridge in the baking dish for up to 3 days or freeze. Rewarm in the oven or microwave
  • You can freeze frittata slices in a sealed container, thaw in the fridge the day before.
Frozen spinach can be used, and you will need 10.5 oz.
Mushrooms: you can replace mushrooms with bacon pieces if not vegetarian.
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Nutrition Facts
Spinach Mushroom Frittata
Amount Per Serving (1 slice)
Calories 320.5 Calories from Fat 231
% Daily Value*
Fat 25.7g40%
Saturated Fat 12g75%
Cholesterol 298.2mg99%
Sodium 516.8mg22%
Potassium 368.4mg11%
Carbohydrates 4.6g2%
Fiber 1.2g5%
Sugar 1.8g2%
Protein 18.2g36%
Vitamin A 3833.8IU77%
Vitamin C 17.2mg21%
Calcium 319.4mg32%
Iron 2.4mg13%
Net Carbs 3.4g
* Percent Daily Values are based on a 2000 calorie diet.
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    3 thoughts on Spinach Mushroom Frittata
  1. 5 stars
    Thank you so much for sharing your wonderful recipes. We are paleo & low carb and this really helps me to make some fresh and healthy meals. 🙂


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