Air Fryer Zucchini Slice (Quiche-Style, Tender and Golden)

Air Fryer Zucchini Slice

What I like about this air fryer method is that it makes zucchini slice practical as a smaller batch, but the part I pay attention to is moisture. If the zucchini is not squeezed very dry, the center can stay wet even when the top already looks done.

This is a crustless, quiche-like zucchini slice baked in a small oven-safe dish right in the air fryer. A moderate 320°F (160°C) temperature, a covered start, and a short rest before slicing help it set evenly without drying out the edges.

Ingredients for Air Fryer Zucchini Slice

• 1.5 pounds zucchini, grated and well squeezed dry (about 3 medium or 4 packed cups, 675g)
• 4 large eggs
• 1/2 cup all-purpose flour (60g)
• 1/2 teaspoon baking powder
• 1/4 cup whole or 2% milk (60g)
• 1 cup shredded cheddar or Colby Jack, lightly packed (115g)
• 1/2 cup finely chopped yellow onion (75g)
• 2 tablespoons chopped fresh parsley or chives
• 1/2 teaspoon kosher salt, plus a pinch for salting the zucchini if needed
• 1/4 teaspoon fine ground black pepper
• Neutral oil or olive oil spray, for greasing the dish

Ingredient note: Fine spices work well in a soft egg batter like this because they distribute evenly without leaving little hot spots of seasoning. If you want a little more savory depth, whisk in 1/2 teaspoon garlic powder with the eggs.

Keep the zucchini as dry as you can; that matters more than anything else for a clean slice. I also like to keep the cheese to about 1 cup so the batter sets nicely instead of turning greasy.

If you need a couple of simple swaps, a 1:1 gluten-free flour blend works in place of all-purpose flour, though the slice will be a little more tender. If you do not want fresh onion, use 1 teaspoon onion powder instead.

Best Pan for Air Fryer Zucchini Slice

A 1.5- to 2-quart oven-safe baking dish works best, such as a 6- to 8-inch square dish or an 8×4-inch loaf dish. Try to keep the batter depth around 1 to 1 1/4 inches so the middle cooks through before the edges dry out.

If you have a choice, ceramic bakes more gently in the air fryer and is less likely to give you dark rims. Metal pans cook faster, so start checking at the early end of the time range. Whatever dish you use, leave about 1 inch of space around it for airflow.

How to Make Air Fryer Zucchini Slice

1. Prepare the dish: Lightly grease a 1.5- to 2-quart oven-safe baking dish. If you want easier lifting, line it with a parchment sling and grease that lightly too.
2. Grate and drain the zucchini: Grate the zucchini, then squeeze it firmly in a clean kitchen towel or cheesecloth until very dry. If your zucchini seems especially wet, toss it with a pinch of salt, let it sit for 5 to 10 minutes, and squeeze again.
3. Mix the batter: In a large bowl, whisk together the eggs, milk, flour, baking powder, salt, and black pepper until smooth. Stir in the cheese, onion, and herbs, then fold in the squeezed zucchini until evenly mixed and no dry flour pockets remain.
4. Preheat the air fryer: Preheat to 320°F (160°C) for 3 to 5 minutes if your air fryer has a preheat setting.
5. Fill and cover: Spoon the batter into the prepared dish and smooth the top. Tap the dish once or twice on the counter to knock out any large air bubbles. Cover tightly with foil, tenting it slightly so it does not touch the batter, and crimp the edges well so it stays put.
6. Cook covered: Place the dish in the air fryer with space around it for airflow. Air fry at 320°F (160°C) for 12 to 15 minutes, until the edges look mostly set and the center is still a little soft.
7. Uncover and finish: Remove the foil carefully, rotate the dish 180 degrees, and return it to the air fryer. If the top looks very pale, give it a light mist of oil. Cook uncovered at 320°F (160°C) for 8 to 15 minutes more, starting to check at the earlier end. It is done when the center has only a slight jiggle, the top is lightly golden around the edges, and a thin knife inserted near the center comes out mostly clean. If you want a temperature check, aim for about 160°F (71°C) in the center.
8. Rest before slicing: Let the zucchini slice rest in the dish for 5 to 10 minutes before cutting. That short rest helps it finish setting and makes the slices cleaner.

I rely on the visual cue more than the clock here because air fryers and pan materials vary. Metal usually bakes faster, while ceramic gives a gentler set.

Air Fryer Time and Temperature for Zucchini Slice

Cook zucchini slice at 320°F (160°C) so the center has time to set before the top over-browns. Start with 12 to 15 minutes covered, then finish with 8 to 15 minutes uncovered.

Start checking early if you are using a metal pan or if your air fryer runs hot. The best doneness cue is a center that is just set with a slight jiggle, not loose or glossy.

How to Keep Air Fryer Zucchini Slice from Turning Watery

The biggest factor is the zucchini. Squeeze it very dry before it goes into the batter, and if it still seems wet, salt it briefly and squeeze again.

It also helps to avoid pushing the cheese too high. Too much cheese or too much trapped moisture can leave the middle soft even after the top has colored.

Troubleshooting Air Fryer Zucchini Slice

The middle is still loose

Cover the dish again and continue cooking at 320°F (160°C) in 3- to 5-minute increments. This usually means the batter was a little deep or the zucchini carried in more moisture than expected.

The edges are browning too fast

This happens more often with metal pans or hotter-running air fryers. Loosely tent the dish with foil, or lower the temperature slightly to 300 to 310°F (150 to 155°C) for the remaining time.

The top looks done but the center is not

Do not keep chasing more color. Cover it back up and finish gently so the eggs set without drying out the rim.

Air Fryer Zucchini Slice Variations

Breaded-top zucchini slice

For a lightly crisp top, mix 1/3 cup panko, 2 tablespoons grated Parmesan, and 1 teaspoon olive oil. Sprinkle it over the slice after the covered cooking phase, then finish uncovered until golden. Watch closely at the end since panko can brown fast near the heating element. If you want more crunch overall, make Air Fryer Zucchini Sticks.

Lighter zucchini slice

Use white whole wheat flour instead of all-purpose flour, reduce the cheese to 3/4 cup, and add an extra 1/2 cup of well-squeezed zucchini. The texture will be a little less rich, so be extra thorough about draining the zucchini.

Serving Air Fryer Zucchini Slice

Serve it warm or at room temperature with a green salad and vinaigrette, or pair it with grilled chicken, sausages, or fish for dinner. It also works well in lunchboxes with cherry tomatoes and hummus.

A spoonful of pesto, hot sauce, or Greek yogurt is good on top. For another easy side, try Air Fryer Zucchini with Parmesan or Air Fryer Zucchini and Squash.

How to Store and Reheat Air Fryer Zucchini Slice

Let the slice cool completely, then refrigerate it in an airtight container for up to 4 days. If you are stacking slices, place parchment between them so they do not stick together.

To reheat, air fry individual slices at 300°F (150°C) for 4 to 6 minutes, until warmed through. The edges can crisp a little again, but the center will stay softer than when freshly made.

You can also microwave a slice for 30 to 60 seconds. Freezing is possible, but I do not think it is the best option here since the texture tends to get wetter after thawing.

Nutrition

Approximate nutrition, based on 6 servings and excluding optional add-ins: each serving is about 1 slice and provides around 180 calories, 11g protein, 10g fat, and 12g carbohydrates.

Approximate per 100g: 110 calories, 6g protein, 6g fat, and 7g carbohydrates.

These numbers are estimates and will vary with the size of the zucchini, the cheese you use, and how much moisture you squeeze out before cooking.