Keto Zucchini and Sausage Casserole

By Lily | Last modified on Feb 28, 2026

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Keto Zucchini and Sausage Casserole

This Keto Zucchini and Sausage Casserole is a comforting blend of savory, cheesy goodness that satisfies cravings without breaking your low-carb goals. Each bite delivers the perfect balance of tender zucchini and seasoned sausage, rounded out with creamy cheeses and herbs that make every forkful a delight.

Ideal for busy weeknights or a cozy dinner, this casserole comes together easily and bakes to golden perfection, creating a hearty meal that the whole family will love.

Why You’ll Love This Recipe

  • Low carb and keto-friendly, perfect for maintaining dietary goals.
  • Combines fresh vegetables with rich sausage and cheeses for balanced flavor.
  • Simple preparation makes it great for busy schedules or meal prepping.
  • Bakes into a warm, cheesy casserole that’s comforting and satisfying.

Ingredients

  • Medium zucchinis: Two fresh zucchinis, sliced thin to ensure tenderness and even baking.
  • Italian sausage: One pound of casings removed, choose mild or spicy based on preference for a flavorful protein base.
  • Diced bell peppers: A cup of colorful peppers adds sweetness and texture contrast to the dish.
  • Shredded mozzarella cheese: One cup provides creamy, melty topping for a luscious finish.
  • Grated Parmesan cheese: Half a cup adds sharp, nutty flavor enhancing the cheese blend.
  • Heavy cream: One cup to create a rich, velvety sauce that ties the casserole together.
  • Minced garlic: Two cloves for aromatic depth and subtle pungency.
  • Italian seasoning: One teaspoon brings fragrant herbs that complement the sausage perfectly.
  • Salt and pepper: To taste, balancing and enhancing all flavors harmoniously.
  • Olive oil: Used for cooking the sausage and vegetables, adding mild fruitiness.

Instructions

Preheat oven and prepare pan

Set your oven to 350°F (175°C) and grease a 9×9-inch baking dish. This ensures even cooking and prevents sticking, making cleanup easier afterward.

Cook the sausage

In a large skillet over medium heat, warm olive oil then add the sausage after removing casings. Break it up with a spoon and cook until browned and cooked through, about 7-10 minutes. Browning the sausage develops rich flavors through caramelization.

Sauté garlic and bell peppers

Add minced garlic and diced bell peppers to the browned sausage. Cook until peppers soften and the garlic is fragrant, about 3-4 minutes. This step layers extra sweetness and aroma into the base of the casserole.

Combine casserole ingredients

Transfer the cooked sausage, garlic, and peppers to a mixing bowl. Add zucchini slices, heavy cream, Italian seasoning, salt, and pepper. Stir gently to coat vegetables with cream and distribute seasonings evenly, ensuring every bite is flavorful.

Assemble and top the casserole

Pour the mixture into the prepared baking dish and spread evenly. Sprinkle shredded mozzarella and grated Parmesan on top, which creates a golden, cheesy crust when baked.

Bake until bubbly and browned

Place casserole in preheated oven and bake for 25-30 minutes until cheese is melted, bubbling, and slightly golden. Baking melds flavors and gives a satisfying texture contrast between creamy interior and crispy top.

Cool and serve

Allow the casserole to cool slightly before serving; this helps it set for easier slicing and enhances flavors as it rests.

You Must Know

  • Using fresh zucchinis with moderate moisture helps avoid a watery casserole.
  • Adjust spice level by choosing mild or spicy sausage based on your taste.
  • Heavy cream adds richness but can be substituted with coconut cream for dairy-free variation.

Storage Tips

Store leftovers covered in the refrigerator for up to 3 days. Reheat gently in the oven or microwave to maintain texture and flavor. This casserole also freezes well for up to 1 month when sealed properly.

Serving Suggestions

Pair this casserole with a crisp green salad or steamed vegetables for a complete meal. It also works well alongside keto-friendly garlic bread or a simple tomato sauce drizzle for added zest.

Professional Tips

  • Drain excess grease from sausage after cooking to prevent sogginess in the casserole.
  • Use a mandoline slicer for evenly sliced zucchini to ensure uniform cooking.
  • For an extra cheesy crust, broil for the last 2 minutes but watch carefully to avoid burning.
  • Let the casserole rest before serving to improve sliceability and flavor melding.

FAQs

Can I use frozen zucchini in this casserole?

Fresh zucchini is preferred due to moisture content; frozen zucchini tends to release excess water and may make the casserole watery.

What can I substitute for Italian sausage?

Ground turkey, chicken sausage, or plant-based sausage alternatives work well for different dietary preferences.

Is this casserole suitable for meal prepping?

Yes, it reheats well and can be portioned for easy grab-and-go keto lunches or dinners throughout the week.

Can I add other vegetables?

Absolutely! Mushrooms, spinach, or zucchini blossoms can be added for extra flavor and nutrients.

How do I reduce the fat content?

Use turkey sausage and reduce or substitute heavy cream with low-fat milk, but this may alter texture and richness.

Can I make this recipe dairy-free?

Replace heavy cream with full-fat coconut milk and use dairy-free cheese alternatives to make it dairy-free and keto-friendly.

What type of cheese works best on top?

Mozzarella and Parmesan give a great melt and flavor; you can also try provolone or gouda for a different twist.

Keto Zucchini and Sausage Casserole

Keto Zucchini Sausage Casserole

Hearty and cheesy, this keto zucchini and sausage casserole delivers savory sausage, tender veggies, and creamy cheese for a satisfying low-carb meal perfect for busy weeknights.
Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Course casserole, dinner
Cuisine American
Servings 4 people
Calories 450 kcal

Equipment

  • 1 skillet for cooking sausage and vegetables
  • 1 9x9-inch baking dish for baking casserole

Ingredients
  

  • 2 medium zucchinis sliced
  • 1 pound Italian sausage casings removed
  • 1 cup diced bell peppers any color
  • 1 cup shredded mozzarella cheese
  • 1/2 cup grated Parmesan cheese
  • 1 cup heavy cream
  • 2 cloves garlic minced
  • 1 teaspoon Italian seasoning
  • Salt and pepper to taste
  • Olive oil for cooking

Instructions
 

  • Preheat oven to 350°F (175°C).
  • Heat olive oil in a large skillet over medium heat. Cook sausage until browned, breaking it up as it cooks.
  • Add minced garlic and diced bell peppers to the skillet and cook until peppers are tender.
  • In a large bowl, combine cooked sausage mixture, sliced zucchini, heavy cream, Italian seasoning, salt, and pepper. Mix well.
  • Transfer mixture into a greased 9x9-inch baking dish and top with mozzarella and Parmesan cheese.
  • Bake for 25-30 minutes until cheese is bubbly and golden. Let cool slightly before serving.

Notes

  • Use mild or spicy Italian sausage to adjust flavor.
  • Store leftovers refrigerated for up to 3 days.
  • For extra crispiness, broil the casserole for 2 minutes before serving.

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