Baked Zucchini Parmigiana al Forno Recipe for Crispy Layers

Why You’ll Love this Recipe

• A delicious twist on a classic—all the comforting flavors of Parmigiana with zucchini instead of eggplant.
• Ideal for summer when zucchini are abundant and fresh.
• Not breaded, so the dish is lighter than many restaurant versions.
• Rich in flavor without being heavy.
• Simple to prepare with straightforward steps and accessible ingredients.

Origins of Parmigiana Recipes

Parmigiana has roots across Italy, with several regions—Sicily, Parma and Naples among them—claiming versions of the dish. While eggplant recipes are the most famous, zucchini preparations have been recorded for centuries. Over time the dish has evolved and adapted to local ingredients and tastes, leading to many variations that include different vegetables, meats, or sauces.

Traditionally, a parmigiana consists of sliced vegetables (eggplant or zucchini), lightly cooked or fried, layered with tomato sauce and cheese, and baked. Some versions include a béchamel or mornay sauce instead of, or in addition to, tomato. In the Italian-American tradition, Chicken Parmigiana evolved from these casseroles into breaded cutlets topped with sauce and melted cheese.

Ingredients

What you need to make Baked Zucchini Parmigiana

• Zucchini: Thinly sliced to create the layers.
• Olive oil: A small amount to lightly sauté the slices.
• Sugo di Pomodoro (tomato sauce): Homemade or a light chunky marinara works well.
• Parmigiano Reggiano: Freshly grated Parmesan brings signature flavor.
• Fresh basil: Adds brightness between the layers.
• Mozzarella: Used sparingly on top for a melty finish.
• Unsalted butter, flour and whole milk: For a creamy béchamel turned into a Parmesan mornay sauce.
• Kosher salt, black pepper, nutmeg and bay leaf: Seasonings to enhance the sauce.
• Panko breadcrumbs: For a crunchy topping.

See the recipe card below for exact quantities.

Substitutions

Common ingredient swaps to suit taste or pantry availability:

• Vegetable swap: Eggplant, Chinese eggplant, yellow squash or other summer squash can replace zucchini.
• Cheese: Pecorino, Grana Padano, aged provolone or asiago can stand in for Parmigiano.
• Milk: 2% or skim milk may be used to reduce richness, though you may need to cook the sauce a bit longer to reach the desired thickness.

How to Make Baked Zucchini Parmigiana

The recipe is straightforward: lightly sauté the zucchini, make a creamy Parmesan sauce, layer zucchini with sugo, sauce, basil and cheeses, then bake until bubbling and golden.

Equipment

Helpful tools for this recipe

• Mandolin (optional): For quick, even 1/8″ slices; a sharp knife works too.
• Baking dish: Individual ramekins or an 8″x8″ ovenproof dish. Smaller dishes make serving easier since the casserole doesn’t slice like lasagna.

Step-by-Step Instructions

Step 1: Prepare the Zucchini

• Slice zucchini lengthwise into thin 1/8″ slices. Lightly season with kosher salt and pepper. In a large skillet over medium-high heat warm the olive oil. Sauté zucchini in single layers for about 30 seconds per side until slightly softened. Transfer to a paper towel-lined plate and set aside.

Step 2: Make the Mornay Sauce

• In a saucepan, melt butter over medium heat. Whisk in flour and reduce heat to medium-low; cook briefly until raw flour scent disappears but the roux stays pale. Gradually whisk in milk, a half cup at a time, to avoid lumps. Add bay leaf, a pinch of nutmeg, salt and pepper and simmer about 5 minutes. Remove the bay leaf and stir in grated Parmesan until smooth to create a mornay sauce. Taste and adjust seasoning.

Step 3: Assemble the Zucchini Parmigiana

• Preheat the oven to 375°F. Mix 1 cup grated Parmesan with panko breadcrumbs and set aside. Spoon a thin layer of tomato sauce into the bottom of your baking dish. Cover with a layer of zucchini, then a layer of the creamy Parmesan sauce, a sprinkle of Parmesan and some torn basil. Add another layer of sugo and repeat until the dish is filled. Finish with a top layer of sauce or zucchini, scattered torn mozzarella, remaining Parmesan and the panko mixture.

Step 4: Bake the Dish

• Bake uncovered for 20–25 minutes until the edges are bubbling and the center is hot (165°F if using a thermometer). Broil on high 2–3 minutes to brown the top. Let the dish rest about 10 minutes before serving.

Variations

Ways to adapt this recipe:

• Add meat: Stir cooked ground beef or Italian sausage into the tomato sauce or layer cooked meat between the vegetables for a heartier bake.
• Thicker slices: Cut zucchini into 1/4″ slices and sauté a bit longer if you prefer more pronounced vegetable texture.
• Make it spicy: Add red pepper flakes to the layers for heat.

Storage

Storing leftovers: Refrigerate covered in an airtight container for up to 5 days.

Reheating: Warm in a 350°F oven until heated through, or reheat on the stovetop or in the microwave if preferred.

Make ahead: Assemble the dish, cover tightly, and refrigerate up to 3 days. Bake covered at 375°F until heated through, then uncover and finish baking and broiling to brown the top.

Freezing: Assembled and frozen in an oven-safe container will keep for about 3 months; thaw before baking for best texture.

Top tip

Don’t overcook zucchini during the initial sauté. A quick turn in the pan softens them enough so they finish perfectly in the oven while retaining some texture.

Troubleshooting

There are few pitfalls. Use cooking times as a guideline and, if desired, an instant-read thermometer to ensure the center reaches at least 165°F before removing from the oven.

What to serve with Baked Zucchini Parmigiana

This can be served as a main course or as a smaller first course or side. Crusty bread is excellent for soaking up sauce. Pair it with a simple salad to keep the meal light or serve alongside meatballs or another protein if you prefer a heartier plate.

Avoid overcooking during the sauté step. A quick 30-second per side sear softens the slices without making them mushy, and they finish in the oven.

No. The skin is tender and adds flavor and color, so leaving it on is fine.

Yes—when sliced to similar thicknesses they cook similarly. Note that eggplant absorbs more oil, so adjust cooking accordingly.

Baked Zucchini Parmigiana