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April 27, 2026

Low Carb Casserole

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Low Carb Casserole–an easy, protein-packed egg casserole loaded with sausage, spinach, zucchini, and cheddar. It’s perfect for meal prep or feeding a crowd.

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Low Carb Casserole

This recipe is naturally low carb without any extra effort. There’s no pasta, bread, or potatoes here…just eggs, savory sausage and veggies like spinach and zucchini. It’s a really satisfying meal (we had it for dinner) that didn’t leave me feeling sluggish or weighed down. It’s a great option if you’re trying to cut back on carbs or just balance out heavier meals throughout the day. This is a good one for meal prep too. It makes for an easy microwaveable breakfast all week. Enjoy!

Ingredients/Substitution Ideas

  • Ground breakfast sausage–or ground turkey breakfast sausage. I used Jimmy Dean brand.
  • Onion–or shallot
  • Spinach–or kale
  • Zucchini–or yellow squash
  • Eggs
  • Kosher salt
  • Black pepper
  • Garlic powder–or 2 tsp minced fresh garlic
  • Greek yogurt–or sour cream
  • Shredded cheddar cheese–or mozzarella or Monterey Jack

Steps

Heat oven to 350° F. Spray a 9×13 inch baking dish with non-stick cooking spray.

Heat a pan over medium high heat. Add in the sausage and break it up. Brown for 4 minutes. Stir in the onion and cook for 4 more minutes. Drain off excess grease. 

Spread the sausage into the bottom of the 9×13 inch pan.

Add spinach and zucchini over the top of the sausage.

In a mixing bowl add the eggs, salt, pepper, garlic powder and Greek yogurt. Whisk until smooth. Pour the mixture over the top of the zucchini. 

Sprinkle cheddar over the top.

Bake for 45 minutes. 

Slice and serve. 

Notes/Tips

  • Serve with fresh fruit, toast or orange juice.
  • If your zucchini is very watery, squeeze out excess moisture with a paper towel before adding it to the dish.
  • I used my 9×13 inch baking dish that is metal. If you use a glass or ceramic baking dish you’ll need to increase the baking time by 5-10 minutes.
  • You can swap in other veggies like mushrooms, bell peppers, or broccoli. Just sauté firmer vegetables first.
  • Slice leftovers into portions and refrigerate for up to 4 days. Reheat in the microwave for 30–60 seconds or until warmed through.
  • Other recipes you can make with zucchini are Instant Pot Zucchini Linguine and Instant Pot Sesame Beef with Zucchini.
Did you know you can filter the recipes on my website to search by meat type, IP or Crockpot, low carb, gluten free, etc.? Use the filter to find exactly what you are looking for. 

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Low Carb Casserole


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  • Author: 365 Days of Slow and Pressure Cooking
  • Prep Time: 20 minutes
  • Cook Time: 45 minutes
  • Total Time: 1 hour 5 minutes
  • Yield: 8 servings 1x
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Description

An easy, protein-packed egg casserole loaded with sausage, spinach, zucchini, and cheddar. It’s perfect for meal prep or feeding a crowd.


Ingredients

Scale
  • 16 oz ground breakfast sausage
  • 1 cup diced onion
  • 2 cups chopped spinach
  • 1 medium zucchini, shredded
  • 12 eggs
  • 1/2 tsp kosher salt
  • 1/2 tsp black pepper
  • 1/2 tsp garlic powder
  • 1/4 cup Greek yogurt
  • 1 1/2 cups shredded cheddar cheese

Instructions

  1. Heat oven to 350° F. Spray a 9×13 inch baking dish with non-stick cooking spray.
  2. Heat a pan over medium high heat. Add in the sausage and break it up. Brown for 4 minutes. Stir in the onion and cook for 4 more minutes. Drain off excess grease. 
  3. Spread the sausage into the bottom of the 9×13 inch pan.
  4. Add spinach and zucchini over the top of the sausage.
  5. In a mixing bowl add the eggs, salt, pepper, garlic powder and Greek yogurt. Whisk until smooth. Pour the mixture over the top of the zucchini. 
  6. Sprinkle cheddar over the top.
  7. Bake for 45 minutes. 
  8. Slice and serve. 
  • Category: Breakfast
  • Method: Baking

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*Karen Petersen is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com.

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Hi, I’m Karen. I know that dinner time can be less than relaxing. Busy schedules and cranky kids and a hundred other things can lead to weariness when it comes to putting dinner on the table. I can help! I make homemade, family-friendly slow cooker and Instant Pot dinners and share the recipes with you.

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