Low Carb Feta Breakfast Casserole

This easy breakfast casserole is made without bread or potatoes and loaded with the flavor of feta, parmesan, and tomato. It’s a fluffy keto breakfast that’s easy to throw together and always impresses!

Update: This recipe was originally published in 2023 and has been republished with all new photos.

This year I shared on instagram the Sausage and Cheddar Breakfast Casserole I make for my family to enjoy after we open presents each Christmas morning. It’s a classic casserole loaded with ground beef or breakfast sausage and cheddar cheese. I received a lot of requests for a low carb version which is why I shared my Low Carb Sausage Cheddar Breakfast Casserole in February. It’s been so popular (and for good reason!) that today I’m sharing another low carb casserole I’m certain you’ll love.

I’m pretty obsessed with feta. It is the winner of the prestigious award for most deliciously unique cheese flavor (this award was created and voted on solely by me) and I can’t get enough of those salty crumbles. In my personal experience (which is vast and significant) feta goes great with literally everything. I like it in salads, on fried eggs with hot sauce, over roasted potatoes or veggies, and even blended into a dip. Honestly I’ve never met a dish with feta that I didn’t like. So it’s really no surprise that feta is the star of the show in this breakfast casserole.

Feta pairs beautifully with tomatoes and spinach to keep this dish light and fast! Simple ingredients but tons of flavor. We’re not even taking the time to cook a meat. No ma’am, let’s assemble this egg casserole quickly and pop it in the oven.

Once finished this healthy breakfast casserole is fluffy, thick, and packed with flavor. There’s so much good stuff in every bite! Enjoy right away or slice and store in the refrigerator for meal prep. Having this quick breakfast ready to go is a life saver on busy mornings! Trust me, the whole family will approve.

Another option if you want something a little smaller is to make one of my frittatas. My Vegetable Frittata, Parmesan Herb Frittata, and Broccoli Cheddar Frittatas are all low carb with big cheese flavor and no meat. Of course if you’re craving a low carb frittata with meat you’d love my Cheeseburger Frittata. Love the idea of savory breakfast foods in a muffin tin? My Beef and Cheese Egg Muffins and Broccoli Cheddar Egg Muffins are low carb recipes that are portable when you need to grab and go!

Low Carb Feta Breakfast Casserole Ingredients

• Eggs: To create this dish we whisk 12 whole eggs with milk and an assortment of seasonings. Together they create the fluffiest low carb breakfast casserole you’ve ever had.
• Milk: I recommend 2%, 1%, or skim milk. All work well in this dish.
• Spinach: Spinach is filled with antioxidants, vitamin K (one cup has almost double the daily requirement), and iron. It’s considered one of the best superfoods! So toss fresh spinach in your breakfast casserole. You won’t notice the flavor but it will do your body so much good!
• Grape tomatoes: Grape tomatoes are the perfect bite sized addition in this casserole. You can also use cherry tomatoes if you slice them in half.
• Feta: This crumbled cheese originates from Greece and was originally made from goat’s or sheep’s milk. Today it’s often made with cow’s milk instead. Either way it adds a rich salty flavor to your breakfast casserole.
• Grated parmesan cheese: This grated cheese is a powdery texture that almost blends into the egg mixture as it cooks. It really compliments the saltiness of the feta so well.
• Seasonings: Italian seasoning, salt, black pepper, ground mustard, and chili powder all create the perfect seasoning blend for extra flavor in this crowd pleasing breakfast dish.

How to Make Low Carb Feta Breakfast Casserole

In a large mixing bowl whisk together eggs, milk, and seasonings. Set aside.

Spread spinach leaves in the bottom of a baking dish. Spread the grape tomatoes on top. Then spread the crumbled feta cheese and grated parmesan over the spinach and tomatoes. Pour egg mixture over everything.

Place the casserole dish in a preheated oven and bake for 50 minutes to 1 hour. Remove from the oven and let sit for 5 minutes before cutting. Slice into 8 individual servings.

What Size Baking Dish Should You Use?

You’ll want to use a 9 x 13 baking dish for this easy recipe.

Can You Prep This in Advance?

Yes! You can assemble this delicious low carb breakfast casserole ahead of time. Sometimes I like to get it ready the night before if I’m preparing it for special occasions like Christmas morning or Easter brunch. Simply cover with aluminum foil or plastic wrap and refrigerate overnight. Pop it in the oven (with no cover) the next morning. It comes out perfectly!

How to Store Leftover Breakfast Casserole

This easy low carb breakfast casserole is the perfect recipe for meal prep. Simply slice and store leftovers in an airtight container in the refrigerator for up to 4 days.

How to Freeze Breakfast Casserole

Want to freeze this casserole so you can enjoy it more than four days after making it? The best way is to first let it completely cool. Then slice into 8 individual servings. Store them in a freezer bag and place in the freezer. When you’re ready to reheat you can wrap each slice in a wet paper towel (to help hold in the moisture) and heat in the microwave for about 30 seconds. Add more time if necessary.

How to Serve This

I love this savory entree for a weekend brunch with fresh fruit or a simple salad. If you’re wanting to do potatoes my Easy Diced Air Fryer Potatoes are a great option. You’ll also enjoy my Easy Seasoned Roasted Potatoes or Skillet Breakfast Potatoes.

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