Air Fryer Zucchini Squares (Easy Bisquick Recipe!)

Air Fryer Zucchini Squares are the easiest way to turn a pile of summer zucchini into something everybody actually fights over. These cheesy, savory bites cook up golden in the air fryer in about 15 minutes — crisp around the edges, tender in the middle, and packed with Parmesan, garlic, and Italian herbs.

Here’s what makes this version better than the old-school casserole: instead of pouring the batter into a pan and slicing it after, you scoop it straight onto parchment paper. Every piece comes out already portioned, with crisp golden edges all the way around instead of just on the outside pieces. No pan to grease, no waiting for it to cool enough to slice, no crumbling in the middle.

If you’ve got a garden overflowing with zucchini (or a neighbor who keeps leaving bags on your porch), this is the recipe you want. It uses Bisquick, so there’s no measuring out flour and leavening. It uses eggs and oil, so it stays rich and moist. And because it cooks in the air fryer instead of the oven, you’re not heating up the whole kitchen in July.

Serve them warm as an appetizer, tuck them alongside grilled chicken as a side dish, or eat three standing over the counter before anyone else knows they’re done. No judgment here.

If this sounds like your kind of recipe, you’ll also want my Air Fryer Zucchini Casserole — same cheesy, egg-rich base, baked and scooped instead.

Why You’ll Love These Zucchini Squares

• Already portioned. A cookie scoop does the work. No slicing, no crumbling, no uneven pieces.
• Crisp edges on every single one. Because each one cooks individually, they all get the golden edges instead of just the corner pieces.
• Fast. Ten to fifteen minutes in the air fryer, start to finish.
• One bowl. Mix, fold, scoop, cook. Minimal cleanup, and no pan to grease.
• Uses up a LOT of zucchini. Three full cups per batch.
• Great hot or room temperature. Perfect for potlucks, parties, and packed lunches.
• Kid-approved. The Parmesan and Bisquick base makes these taste more like savory biscuits than “vegetable casserole.”
• Freezer-friendly. Make a double batch and stash half.

What Are Zucchini Squares?

Zucchini squares are a classic potluck appetizer — a savory batter of eggs, cheese, and baking mix folded around shredded zucchini, baked until set, then cut into bite-size pieces. Think of them as a cross between a frittata, a savory biscuit, and a zucchini fritter.

The traditional version bakes in a 9×13 pan in a 350°F oven for close to half an hour, then gets sliced into squares. This air fryer zucchini squares version skips the pan entirely. Scooping the batter onto parchment cuts the cook time way down, gives you crisp edges on every piece, and means you’re not fighting a hot casserole with a knife.

Ingredients

Here’s everything you need — all pantry staples plus one very abundant summer vegetable.

• Eggs: the structure and the richness. Beat them well before adding anything else.
• Vegetable oil: keeps the squares moist. Canola, avocado, or light olive oil all work.
• Parmesan cheese: grated. Freshly grated melts in better, but the shelf-stable green-can kind works fine and is what most classic versions call for.
• Salt: brings all the savory flavors forward.
• Italian seasoning: or make your own with dried basil, oregano, and thyme.
• Garlic powder: Adjust to your taste.
• Grated onion: grate it on a box grater so it melts into the batter instead of leaving crunchy chunks.
• Bisquick: or any all-purpose baking mix. If you’ve made my Air Fryer Bisquick Biscuits, you already know this mix behaves beautifully at air fryer temperatures.
• Grated zucchini: roughly 2 medium zucchini, squeezed well. Do not skip the drying step.

Ingredient Swaps and Substitutions

• No Bisquick? Substitute 2 cups all-purpose flour + 1 tablespoon baking powder + 1 teaspoon salt + 3 tablespoons cold butter cut in. (It’s the same ratio I use for my Air Fryer Buttermilk Biscuits from Scratch.)
• Gluten-free: Use Gluten-Free Bisquick 1:1.
• Cheese swaps: Sharp cheddar, Pecorino Romano, Asiago, or a blend. Add ½ cup shredded mozzarella for extra pull.
• Add-ins: Crumbled cooked bacon, diced ham, chopped sun-dried tomatoes, or a few tablespoons of chopped fresh parsley or basil.
• Heat: A pinch of red pepper flakes or a few dashes of hot sauce in the batter.
• Yellow squash works identically — or use half zucchini, half yellow squash for color.

How to Make Air Fryer Zucchini Squares

Step 1: In a large mixing bowl, whisk together the beaten eggs, vegetable oil, Parmesan cheese, salt, Italian seasoning, garlic powder, and grated onion until smooth and evenly combined.

Step 2: Add the Bisquick and fold it in gently. Stop as soon as you no longer see dry streaks — overmixing develops gluten and makes them tough instead of tender.

Step 3: Grate the zucchini on the large holes of a box grater. Spread it out on a double layer of paper towels, top with more paper towels, and press firmly to squeeze out the excess liquid.

This is the single most important step in the whole recipe. Zucchini is over 90% water. If you skip it, that water releases during cooking and your batter spreads into flat, wet puddles instead of holding its shape. For best results, wrap the grated zucchini in a clean kitchen towel and wring it out over the sink like you’re wringing out a washcloth. You’ll be shocked how much liquid comes out.

It’s the exact same technique I use for Air Fryer Zucchini Tots — squeeze it dry and everything else falls into place.

Step 4: Fold the dried zucchini into the batter until evenly distributed. The batter should be thick and scoopable — closer to drop-biscuit dough than pancake batter. If it looks loose, your zucchini needed more squeezing.

Step 5: Line your air fryer basket with a piece of parchment paper cut to fit, leaving about a half inch of clearance around the edges so air can still circulate. Using a cookie scoop, drop portions of batter onto the parchment, spacing them about an inch apart. Flatten each one slightly with the back of the scoop or a spoon so they cook through evenly instead of staying domed in the middle.

Don’t crowd the basket. Work in batches if you need to — this is what gives every piece those crisp golden edges.

Step 6: Cook at 330°F on the air fry setting for 10 to 15 minutes, until puffed, set, and golden on top. Start checking at the 8-minute mark. Individual scoops cook faster than a full pan of batter, and every air fryer runs a little differently. If the tops are browning faster than the centers are setting, lay a piece of foil loosely over them for the last few minutes.

Step 7: The tops should be golden and spring back lightly when touched, and a toothpick inserted into the center of one should come out clean with no wet batter clinging to it. If they need more time, add 2 to 3 minutes and check again.

Step 8: Let them sit for 2 to 3 minutes before moving them — they firm up as they cool and lift off the parchment cleanly.

Tips for the Best Air Fryer Zucchini Squares

Dry the zucchini more than you think you need to. Then do it one more time. Wet zucchini is the number one reason these spread out flat instead of holding their shape.

Cut the parchment to fit. Leave a half inch of clearance around the edge of the basket so air can circulate underneath. Pre-cut perforated air fryer parchment rounds work great, or trim your own.

Weigh the parchment down before the air fryer comes up to speed. Loose parchment can fly up into the heating element. Put the batter on it first, or set the basket in and let the fan settle before you add the paper.

Use a cookie scoop, not a spoon. A 1½-tablespoon scoop gives you even portions that all cook in the same amount of time. Uneven blobs mean some are raw while others are overdone.

Flatten them slightly. A domed scoop of batter cooks unevenly — the center stays wet while the outside sets. A gentle press with the back of the scoop fixes it.

Don’t crowd the basket. Leave an inch between each one. Crowding traps steam and you lose the crisp edges entirely.

Every air fryer is different. Basket-style models run hotter than oven-style ones. Start checking at 8 minutes the first time you make this, and note what works for your machine.

Room-temperature eggs blend more smoothly into the batter than cold ones.

Serving Suggestions

These are genuinely flexible. Serve them:

• As an appetizer — piled on a platter with marinara, ranch, or garlic aioli for dipping. For a bigger spread, set them out next to my Air Fryer Cheesy Dip or Air Fryer Pizza Dip — the garlic and Parmesan in these squares play beautifully with both.
• As a side dish — alongside Air Fryer Butterflied Chicken Breast, Air Fryer Split Chicken Breast, steak, or Air Fryer Salmon Steaks.
• With a big salad — they turn a light meal into a real dinner. Try them with my Air Fryer Grilled Chicken Caesar Salad.
• For brunch — they’re eggy enough to hold their own next to bacon and fruit.
• In lunchboxes — they’re great at room temperature and travel well.
• With soup — especially my Easy Air Fryer Tomato Soup or a bowl of minestrone. Use them the way you’d use a biscuit, for dunking.

How to Store, Reheat, and Freeze

Refrigerator: Store cooled zucchini squares in an airtight container in the fridge for up to 4 days.

Freezer: Freeze cooled pieces in a single layer on a baking sheet until firm, then transfer to a freezer bag. Because they’re already portioned, you can pull out exactly as many as you want. They’ll keep for up to 3 months.

Reheating: The air fryer is the best method — 3 to 4 minutes at 320°F brings back the crisp edges. The microwave works in a pinch (20 to 30 seconds) but softens the texture. From frozen, air fry 5 to 7 minutes at 320°F.

Make ahead: You can mix the batter up to a few hours in advance and refrigerate it, but the zucchini will keep releasing water. Give it a stir and drain off any pooled liquid before scooping.

Frequently Asked Questions

Do I need to peel the zucchini? No. The skin is thin, tender, and adds nice green flecks throughout. Just wash and trim the ends.

Do I need to salt the zucchini first? It’s optional but helpful. Tossing the grated zucchini with ½ teaspoon of salt and letting it sit in a colander for 20 minutes draws out even more moisture. Squeeze it well and reduce the salt in the batter slightly to compensate.

Can I use foil instead of parchment? Parchment is better here. Foil doesn’t release as cleanly and can stick to the bottoms. If foil is all you have, spray it well with cooking spray first.

Why did mine spread out flat? The batter was too wet, which almost always traces back to under-squeezed zucchini. Wring it out in a kitchen towel until it stops dripping. If the batter still looks loose, stir in an extra 2 to 3 tablespoons of Bisquick to tighten it up.

Can I make this in the oven instead? Yes. Scoop onto a parchment-lined baking sheet and bake at 350°F for 18 to 22 minutes, until golden and set.

Can I make it as a casserole instead? You can — pour the batter into a greased baking dish that fits your air fryer basket and cook at 330°F for 15 to 20 minutes, then slice. You’ll lose the crisp edges on the interior pieces, which is exactly why the scoop method is better.

Can I use a different baking mix? Yes — any all-purpose baking mix works, including gluten-free versions. Or use the from-scratch substitute in the swaps section above.

How do I know when they’re done? The tops should be golden and spring back when touched lightly, and a toothpick in the center should come out clean.

Can I double the recipe? Absolutely — just cook in batches so you’re not crowding the basket. They hold their heat well, and you can pop the first batch back in for a minute at the end to warm everything through.

Are these keto or low-carb? No, Bisquick is flour-based. For a low-carb version, substitute almond flour plus baking powder, though the texture will be denser and more crumbly. If you want something naturally low-carb instead, try my Crispy Air Fryer Zucchini Slices Without Flour.

Can I use frozen zucchini? You can, but thaw it completely and squeeze it very dry first — frozen zucchini holds even more water than fresh.

More Air Fryer Zucchini Recipes

Still buried in zucchini? Here’s where the rest of it should go:

• Air Fryer Zucchini Casserole — the baked-and-scooped cousin of this recipe
• Air Fryer Zucchini Tots — crispy, dippable, and kid-approved
• Air Fryer Breaded Zucchini — golden, crunchy, and perfect with marinara
• Copycat Red Robin Zucchini Fries — restaurant-style at home
• Air Fryer Zaatar Zucchini — bold Mediterranean flavor in under 15 minutes
• Air Fryer Zucchini Noodles (Zoodles) — a light, low-carb pasta swap
• Crispy Air Fryer Zucchini Slices Without Flour — naturally low-carb and ready fast