Zucchini Pizza Casserole Recipe tastes like cheesy, saucy comfort food with a veggie twist that still feels like classic pizza night. It works perfectly for busy families, low-carb eaters, or anyone who wants a cozy dinner on the table in about 45–55 minutes. I have made this so many times that my kids now call it “pizza lasagna’s zucchini cousin.”

Why You Should Try This Zucchini Pizza Casserole Recipe

This Zucchini Pizza Casserole Recipe gives you all the flavors of a loaded pizza in a fork-friendly, bubbly casserole. You still get melty cheese, savory sauce, and your favorite toppings, just with a lighter zucchini base instead of a heavy crust.

The recipe uses simple ingredients and flexible toppings, so you can clean out the fridge and still get a great dinner. It also reheats really well, which makes it perfect for meal prep or next-day lunches.

“Tastes like my favorite pizzeria in cozy casserole form, and I didn’t even miss the crust. ★★★★★”

Ingredients You’ll Need

Zucchini “Crust” Layer

4 cups shredded zucchini
- Pack the zucchini fairly tight in the measuring cup. I like medium zucchini because they shred easily and don’t taste watery.
2 large eggs
- Use room temperature eggs if possible for easier mixing.
1 cup shredded mozzarella cheese
- Low-moisture, part-skim mozzarella works best and browns nicely.
1/2 cup grated Parmesan cheese
- Shelf-stable green can Parmesan works in a pinch, but fresh grated tastes richer.
1/2 teaspoon garlic powder
1/2 teaspoon onion powder
1 teaspoon Italian seasoning
1/2 teaspoon kosher salt
1/4 teaspoon black pepper

Sauce & Topping Layer

1 pound ground Italian sausage or lean ground beef
- Use mild or hot sausage depending on your spice preference. Turkey sausage also works.
1 small onion, finely chopped
2 cloves garlic, minced
1 1/2 cups pizza sauce or thick marinara
- Jarred pizza sauce saves time; choose one with low added sugar if you watch carbs.
1 1/2–2 cups shredded mozzarella cheese, divided
1/4 cup grated Parmesan cheese
1/2 teaspoon dried oregano
1/2 teaspoon dried basil

Optional Pizza Toppings

Use what your family loves on pizza. Some ideas:

1/2 cup sliced pepperoni
1/2 cup sliced black olives
1/2 cup diced bell peppers
1/2 cup sliced mushrooms
1/4 cup sliced green onions
A pinch of red pepper flakes for heat

Pantry Shortcuts & Substitutions

Use pre-shredded zucchini from the store if you find it, but squeeze it very well.
Swap pizza sauce with your favorite jarred marinara and add extra Italian seasoning.
Replace mozzarella with an Italian blend cheese if that is what you have.
Skip meat and add extra veggies for a vegetarian version; add more cheese for richness.

Equipment List

9×13 inch baking dish
Large mixing bowl
Box grater or food processor with shredding disc
Large skillet
Wooden spoon or spatula
Colander and clean kitchen towel (for squeezing zucchini)
Measuring cups and spoons

Tips & Tricks

Squeeze the zucchini very well so the casserole bakes firm, not watery.
Line a colander with a clean towel, salt the zucchini lightly, let it sit 10 minutes, then twist and squeeze out as much liquid as you can.
Use a thicker pizza sauce or simmer a thinner sauce for a few minutes to reduce extra moisture.
Brown the sausage or beef until you see deep golden bits; those browned bits add big flavor.
Drain extra grease from the skillet so the casserole does not turn greasy.
Layer cheese on top during the last 10–15 minutes of baking so it melts and browns without burning.
Let the casserole rest 10 minutes before slicing so it sets and cuts cleanly.
Prep the zucchini base earlier in the day, then top and bake at dinnertime to save time.
Cut leftovers into squares and pack them in lunch containers for easy reheats.

How to Make Zucchini Pizza Casserole Recipe

Step 1: Prep the Zucchini

Preheat your oven to 400°F and lightly grease a 9×13 inch baking dish. Shred the zucchini on the large holes of a box grater or in a food processor. Place the shredded zucchini in a towel-lined colander, sprinkle with a pinch of salt, and let it sit 10 minutes so it releases liquid.

After 10 minutes, gather the towel around the zucchini and twist firmly over the sink. Squeeze until you remove as much liquid as possible; the zucchini should feel fairly dry and clump together. This step keeps the Zucchini Pizza Casserole Recipe from turning soggy.

Step 2: Mix and Bake the Zucchini Base

Place the squeezed zucchini in a large mixing bowl. Add eggs, 1 cup mozzarella, 1/2 cup Parmesan, garlic powder, onion powder, Italian seasoning, salt, and pepper. Stir until everything mixes evenly and the zucchini looks coated with egg and cheese.

Spread this mixture into the prepared baking dish and press it into an even layer, almost like a thick crust. Bake for 15–20 minutes until the edges look lightly golden and the top feels set. While the zucchini base bakes, start the meat and sauce layer.

Step 3: Cook the Meat and Sauce

Heat a large skillet over medium heat. Add the Italian sausage or ground beef and break it up with a spoon. Cook until the meat browns and no pink remains, about 6–8 minutes.

Add the chopped onion and cook 3–4 minutes until it softens and turns translucent. Stir in the minced garlic and cook 30 seconds until fragrant. Drain extra grease from the skillet, then pour in the pizza sauce, oregano, and basil, and stir everything together.

Let the sauce mixture simmer for 3–5 minutes so the flavors blend and the sauce thickens slightly. Taste and adjust salt or pepper if needed. Turn off the heat and set the skillet aside.

Step 4: Assemble the Casserole

Take the baked zucchini base out of the oven. Spoon the meat and sauce mixture evenly over the zucchini layer. Spread it to the edges so every bite gets sauce and meat.

Sprinkle 1 1/2–2 cups shredded mozzarella over the top, depending on how cheesy you like it. Add the 1/4 cup Parmesan. Scatter your chosen toppings such as pepperoni, olives, peppers, or mushrooms over the cheese.

Step 5: Bake Until Bubbly and Golden

Return the casserole to the 400°F oven. Bake 15–20 minutes until the cheese melts, bubbles, and turns lightly golden in spots. If you want deeper browning, switch to broil for 1–2 minutes, but watch closely so the cheese does not burn.

Remove the Zucchini Pizza Casserole Recipe from the oven and let it rest 10 minutes. This short rest helps the layers set so you can cut neat squares. Slice and serve hot.

What to Serve with Zucchini Pizza Casserole Recipe

Serve this Zucchini Pizza Casserole Recipe with a simple green salad tossed with crisp lettuce, cucumbers, and a tangy vinaigrette. Garlic bread or cheesy breadsticks pair nicely if you do not need the meal to stay low carb. Kids usually love a side of carrot sticks or sliced cucumbers with ranch for dipping. Add a bowl of fresh fruit like grapes, berries, or melon to round out the meal and keep things bright.

Storage Options

Store leftovers in an airtight container in the fridge for up to 4 days.
Reheat single portions in the microwave for 1–2 minutes, or in a 350°F oven for 10–15 minutes until hot.
Freeze cooled slices in a freezer-safe container or wrapped tightly for up to 2 months.
Reheat frozen portions in a covered baking dish at 350°F for about 25–30 minutes, or thaw in the fridge overnight and reheat until warmed through.