Zucchini Pizza Casserole

This zucchini pizza casserole gives you everything you love about pizza night, the gooey melted mozzarella, the savory marinara, the pepperoni, the bubbling edges, without any dough holding it together. Shredded zucchini forms the base, and once you squeeze out all the moisture and pre-bake it with eggs and Parmesan, it sets into a surprisingly firm foundation that holds the toppings beautifully. My dad Albert had a philosophy at Varied Recipes: give people the flavors they crave in a form that makes sense. This casserole is built on that same thinking. It is a genuinely satisfying dinner that also happens to be low-carb, and my daughters ask for it regularly without any prompting from me.

Why You’ll Love This Zucchini Pizza Casserole

The texture of the zucchini base is what surprises people the most when they try this for the first time. If you squeeze the shredded zucchini properly, and I mean really squeeze it until it feels almost dry, it bakes up chewy and firm rather than soggy or wet. That step is non-negotiable. Everything else about this recipe is flexible: the toppings work with almost any combination of vegetables, proteins, or cheese blends you prefer. I use lean ground beef here but Italian turkey sausage is equally good and a bit lighter. The pre-bake step sets the crust before the toppings go on, which gives you distinct, clean layers when you slice and serve it.

Ingredients for Zucchini Pizza Casserole

Here is everything you need:

The Zucchini Base

• 4 medium zucchinis, shredded (about 6 cups)
• 1 teaspoon salt (for drawing out moisture)
• 2 large eggs, beaten
• 1/2 cup grated Parmesan cheese
• 2 cups shredded mozzarella cheese, divided

The Pizza Toppings

• 1/2 lb lean ground beef or Italian turkey sausage, browned and drained
• 1/2 cup sugar-free marinara or pizza sauce
• 1/4 cup pepperoni slices (turkey pepperoni for a leaner option)
• 1/4 cup diced bell peppers
• 1/2 teaspoon dried oregano or Italian seasoning

On the zucchini quantity: six cups of shredded zucchini sounds like a lot until you squeeze the moisture out and realize it compresses down significantly. Start with four medium zucchinis and you will have exactly the right amount for the base layer to cover a 9×13 dish. A box grater works fine here, though a food processor with a shredding disc saves a few minutes if you have one.

If you enjoy low-carb vegetable-forward bakes that deliver on comfort food flavor, this ricotta eggplant casserole uses a similar baked vegetable base approach and is a great companion recipe to have in the rotation.

How to Make Zucchini Pizza Casserole

Two bake phases and about 20 minutes of prep stand between you and pizza night without the carbs.

1. Salt and drain the zucchini. Place the shredded zucchini in a colander and toss with 1 teaspoon of salt. Let it sit for 10 to 15 minutes. Then transfer it to a clean kitchen towel or cheesecloth and squeeze as hard as you can until the zucchini feels almost dry to the touch. This is the single most important step. Undersqueezed zucchini will make the base watery and the whole casserole will be loose and difficult to slice.
2. Make the base. In a large bowl, combine the squeezed zucchini, beaten eggs, Parmesan, and 1 cup of the mozzarella. Mix until everything is well incorporated.
3. Pre-bake the crust. Press the zucchini mixture firmly and evenly into a greased 9×13-inch baking dish. Bake at 400 degrees F for 20 minutes until the edges are golden and the base is set and no longer wet-looking in the center.
4. Add the toppings. Remove the dish from the oven. Spread the pizza sauce evenly over the base, then distribute the browned meat and diced bell peppers across the surface. Sprinkle the remaining 1 cup of mozzarella over everything.
5. Add pepperoni and seasonings. Lay the pepperoni slices across the top and dust with Italian seasoning.
6. Final bake. Return the dish to the oven and bake for 15 to 20 minutes until the cheese is fully melted and bubbling at the edges.
7. Rest before slicing. Let the casserole sit for 5 to 10 minutes before cutting. The base firms up further as it cools slightly, making it much easier to serve in clean slices.

In my kitchen, I squeeze the zucchini in batches using a clean dish towel, twisting it tight over the sink. It takes about two minutes total and the difference in the finished casserole is dramatic.

What to Serve with Zucchini Pizza Casserole

Because the casserole is already rich with cheese and sauce, lighter sides complement it best. A crisp Caesar salad is the most natural pairing and echoes the Italian flavor profile of the toppings. Garlic-roasted asparagus is another excellent option that adds color and a slightly bitter contrast to the savory, cheesy main. If you want to keep the whole meal low-carb, sliced cucumbers and cherry tomatoes with a simple olive oil and red wine vinegar dressing work beautifully alongside it. For a more substantial spread, warm garlic bread rounds it out into a fuller dinner, though the casserole is quite filling on its own. Emily usually serves this with a simple arugula salad topped with shaved Parmesan and a squeeze of lemon when she makes it for weeknight dinners.

Pro Tips and Variations

Squeeze until it feels almost dry. Most people stop squeezing too early. Keep going until the zucchini barely releases any more liquid when you wring it out. This is the step that determines whether your casserole has a firm, sliceable base or a wet, loose one.

Pre-bake fully before topping. The base should look set and golden at the edges before the sauce and toppings go on. Adding toppings to an underbaked base adds extra moisture and works against the texture you are building.

Make it vegetarian. Swap the ground beef and pepperoni for sliced mushrooms, black olives, and a handful of spinach. The cheese and sauce carry the flavor profile just as well without any meat.

Sturdier crust option. Adding 1/4 cup of almond flour to the zucchini base mixture gives the crust a slightly denser, more dough-like texture. I use this variation when I am serving it to guests who are skeptical about a vegetable-based pizza crust.

For another satisfying vegetarian bake that uses a cheese and egg base to deliver big flavor without heavy carbs, this vegetarian baked spaghetti is worth bookmarking alongside this recipe.

Storage and Reheating Tips

Store leftover zucchini pizza casserole in an airtight container in the refrigerator for up to 4 days. The base firms up further overnight, which actually makes cold slices easier to handle and excellent for next-day lunches. Reheat in a 350-degree oven for 10 to 12 minutes to maintain the texture of the base, or microwave covered in 60-second intervals if you are in a hurry. The oven method is worth the extra few minutes if you want the cheese to bubble back up and the base to stay firm rather than steamed-soft.

This zucchini pizza casserole proves that eating well and eating satisfying food are not mutually exclusive. It delivers every flavor note you want from pizza night in a form that fits into a healthy weeknight routine without compromise. Dad Albert always believed that the best recipes are the ones that do not ask you to give anything up. This one fits that standard exactly. For more low-carb dinner ideas and easy bakes worth exploring, browse our full recipe collection.

Zucchini Pizza Casserole

A low-carb pizza bake with a firm shredded zucchini and mozzarella crust topped with marinara, ground beef, pepperoni, and bubbling cheese for a satisfying high-protein dinner.

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Prep Time 20 minutes mins

Cook Time 35 minutes mins

Total Time 55 minutes mins

Servings: 6 servings

Course: Dinner, Main Course

Cuisine: American, Italian-American

Calories: 310

Ingredients Equipment Method Notes

Ingredients

  

• 4 medium zucchinis shredded, about 6 cups
• 1 tsp salt for drawing moisture from the zucchini
• 2 large eggs beaten
• 0.5 cup Parmesan cheese grated
• 2 cups shredded mozzarella cheese divided: 1 cup for the base, 1 cup for topping
• 0.5 lb lean ground beef or Italian turkey sausage browned and drained
• 0.5 cup sugar-free marinara or pizza sauce
• 0.25 cup pepperoni slices turkey pepperoni for a leaner option
• 0.25 cup diced bell peppers
• 0.5 tsp dried oregano or Italian seasoning

Equipment

• 9×13-inch baking dish
• Box grater or food processor
• Clean kitchen towel or cheesecloth
• large skillet

Method

 

1. Toss shredded zucchini with 1 teaspoon of salt in a colander. Let sit for 10 to 15 minutes, then transfer to a clean kitchen towel and squeeze out as much moisture as possible until the zucchini feels almost dry.
2. Preheat the oven to 400 degrees F. In a large bowl, combine the squeezed zucchini, beaten eggs, Parmesan, and 1 cup of the mozzarella. Mix until well combined.
3. Press the zucchini mixture firmly and evenly into a greased 9×13-inch baking dish. Bake for 20 minutes until the edges are golden and the base is set.
4. Remove from the oven. Spread the pizza sauce evenly over the base. Top with the browned meat and diced bell peppers, then sprinkle the remaining 1 cup of mozzarella over everything.
5. Arrange the pepperoni slices on top and dust with Italian seasoning.
6. Return to the oven and bake for 15 to 20 minutes until the cheese is melted and bubbling.
7. Let the casserole rest for 5 to 10 minutes before slicing. The base firms up further as it cools slightly.

Notes

Storage: Refrigerate in an airtight container for up to 4 days. The base firms up overnight and makes excellent next-day lunches.

Reheating: Reheat in a 350 F oven for 10 to 12 minutes to maintain base texture. Microwave covered in 60-second intervals if needed.

Squeeze tip: Squeeze the zucchini until it feels almost completely dry. Undersqueezed zucchini is the primary cause of a watery, loose casserole.

Sturdier base: Add 1/4 cup almond flour to the zucchini mixture for a denser, more dough-like crust.

Vegetarian: Replace ground beef and pepperoni with sliced mushrooms, black olives, and spinach.