Zucchini Pizza Casserole Recipe tastes like a cheesy pan pizza with a savory zucchini base that stays tender yet sturdy, with crispy pepperoni on top and bubbling sauce in every bite. This dish works for low-carb eaters, gluten-free friends, and weeknight cooks, and the total time runs about 55 minutes start to finish. I grew up in the Midwest and still crave this when zucchini piles up on my counter.
Why This Zucchini Pizza Casserole Recipe
Zucchini Pizza Casserole Recipe skips dough, so you avoid kneading and waiting. You press a zucchini, egg, and cheese mixture into the pan, then bake it like a crust. It tastes like pizza night, minus the flour all over your shirt.
You can use pantry staples and a few shortcuts. Jarred marinara, pre-shredded mozzarella, and sliced pepperoni get dinner moving. Toppings stay flexible, so you can clear out the fridge and still win dinner.
Ingredients You Need
- Zucchini, 4 packed cups shredded (about 2 large)
- Kosher salt, 1 teaspoon for salting the zucchini, plus a pinch for the mix
- Eggs, 2 large, lightly beaten
- Mozzarella, 2 cups shredded part-skim, divided (pre-shredded works)
- Parmesan, 1/2 cup grated
- Almond flour, 1/3 cup for structure (or use 1/2 cup pork panko; use 1/3 cup plain breadcrumbs if you do not need low-carb)
- Italian seasoning, 1 teaspoon
- Garlic powder, 1/2 teaspoon
- Onion powder, 1/2 teaspoon
- Black pepper, a few grinds
- Marinara or pizza sauce, 1 to 1.5 cups (Rao’s and Muir Glen taste great and run low in sugar)
- Italian sausage or lean ground beef, 8 ounces cooked and drained, optional
- Pepperoni slices, 2 to 3 ounces, optional (Boar’s Head or Applegate crisp up nicely)
- Veggie toppers, optional: 1 small bell pepper diced, 4 ounces mushrooms sliced, 1/4 cup black olives sliced
- Red pepper flakes, pinch, optional
- Olive oil or cooking spray for the pan
- Fresh basil or parsley for garnish
Equipment:
- 9×13 inch baking dish
- Box grater or food processor with shredding disc
- Colander and a clean kitchen towel
- Large skillet and wooden spoon
- Mixing bowls and measuring tools
How to Make Zucchini Pizza Casserole
- Prep Time: 20 minutes
- Cook Time: 35 minutes
- Total Time: 55 minutes
- Heat the oven to 400°F. Lightly coat a 9×13 inch baking dish with olive oil or cooking spray.
- Shred the zucchini. Toss it with 1 teaspoon kosher salt in a colander and let it sit for 10 minutes. Squeeze out as much liquid as you can with a clean towel until the zucchini feels dry.
- Mix the base: In a bowl, combine the squeezed zucchini, eggs, 1 cup mozzarella, Parmesan, almond flour or your chosen binder, Italian seasoning, garlic powder, onion powder, a pinch of salt, and black pepper.
- Press the zucchini mixture into the baking dish in an even layer. Bake for 15 minutes to set the base.
- Cook the meat while the base bakes: Brown the sausage or ground beef in a skillet over medium heat, breaking it up. Drain excess fat.
- Top the base: Spread marinara over the baked zucchini base. Scatter cooked meat and any veggies over the sauce. Sprinkle the remaining 1 cup mozzarella over the top, then add pepperoni and a pinch of red pepper flakes if you like heat.
- Bake for 15 to 20 minutes, until the cheese bubbles and the edges look golden. If you want more browning, switch on the broiler for 1 to 2 minutes and watch closely.
- Let the casserole rest for 10 minutes. Garnish with basil, slice into squares, and serve hot.
Tips & Common Mistakes
- Salt and squeeze the zucchini like you mean it; excess water makes a soggy base.
- Do not skip the par-bake of the base; it sets the structure.
- Keep sauce to 1 to 1.5 cups; too much sauce adds water.
- Pre-cook mushrooms and peppers to drive off moisture and boost flavor.
- Use part-skim mozzarella for better melt and less grease.
- Drain cooked meat well so the casserole does not weep.
- Let it rest 10 minutes before slicing; the squares hold shape and cut clean.
Variations I’ve Tried
- Supreme style: sausage, bell pepper, onion, mushrooms, olives.
- Meat lovers: sausage, pepperoni, bacon crumbles, a little extra Parmesan.
- Veggie: skip meat; add roasted peppers, onions, mushrooms, and spinach.
- Margherita vibes: fresh mozzarella pearls, basil, and thin tomato slices with a light hand on sauce.
- Spicy: hot Italian sausage, jalapeño rings, and extra red pepper flakes.
- Dairy-free: use dairy-free mozzarella and skip Parmesan; add extra herbs for punch.
How to Serve Zucchini Pizza Casserole
Serve big squares with a crisp green salad or Caesar salad. Offer garlic bread for the carb crew and roasted broccoli or a simple arugula salad for low-carb plates. I like a chillable red or a bubbly water with lemon on the side. Kids tend to call dibs on the cheesy corner pieces, so plan accordingly.
Make-Ahead and Storage
- Make ahead: Press and par-bake the zucchini base up to 24 hours in advance. Cool, cover, and refrigerate. Add sauce, toppings, and cheese, then bake 20 to 25 minutes.
- Fridge: Store leftovers in a covered container for up to 4 days.
- Freezer: Chill completely, then wrap slices tightly and freeze for 2 to 3 months. For a whole pan, wrap well in two layers.
- Reheat: Warm slices in a 350°F oven on a sheet pan for 12 to 15 minutes. Air fryer method works fast at 325°F for 6 to 8 minutes. Microwave works in a pinch, but the oven gives you a better edge.
Nutrition Information
Per serving, about 1 of 8: 320 calories; 22 g protein; 21 g fat; 9 g total carbs; 3 g fiber; 6 g net carbs; 720 mg sodium. Numbers reflect zucchini base, 1 pound lean Italian turkey sausage, part-skim mozzarella, pepperoni, and 1 cup marinara. Values vary by brands, toppings, and portion size.
Zucchini Pizza Casserole Recipe
Ingredients
Instructions
- Preheat oven to 375°F (190°C).
- In a baking dish, spread half of the sliced zucchini.
- Layer half of the pizza sauce over the zucchini.
- Sprinkle with half of the mozzarella and parmesan cheeses.
- Add pepperoni slices if using.
- Repeat layers with remaining zucchini, sauce, and cheeses.
- Sprinkle Italian seasoning on top.
- Bake uncovered for 25-30 minutes until cheese is melted and bubbly.
- Let cool for a few minutes before serving.