Air Fryer Flourless Peanut Butter Blondies

There’s a particular kind of magic that happens when peanut butter, brown sugar, and a little heat get together. You don’t need flour. You don’t need a stand mixer. You don’t even need to turn on your oven and heat up the whole kitchen. You need one bowl, a spoon, and an air fryer.

These flourless peanut butter blondies are the dessert I make when a craving hits hard and patience is in short supply. The edges go golden and slightly crisp, the centers stay dense and almost truffle-like, and the whole thing tastes like the inside of a peanut butter cup that decided to grow up. Best of all, the air fryer does it in a fraction of the time a regular oven takes.

If you’ve never baked in an air fryer before, this is the perfect recipe to start with. It’s nearly foolproof.

Why You’ll Love This Recipe

• No flour required. These are naturally gluten-free, and the peanut butter does all the structural work that flour normally would.
• One bowl, no mixer. Everything comes together with a whisk or a sturdy spoon. Minimal cleanup.
• Fast. From craving to first bite in about 20 minutes.
• Six core ingredients. Most of them are probably already in your pantry.
• Forgiving. Air fryer blondies are hard to mess up, and easy to adjust to your taste.

Ingredients

For a small batch (one 6- to 7-inch pan, about 9 squares):

• Creamy peanut butter: Replaces flour entirely; use no-stir, not natural drippy.
• Brown sugar: Adds moisture and that signature caramel butterscotch note.
• Egg: Binds everything and gives the blondies their structure.
• Vanilla extract: Rounds out flavor so peanut butter isn’t flat.
• Baking soda: The only leavening; keeps them tender, not dense.
• Salt: Sharpens flavor and balances all that sweetness nicely.
• Chocolate chips: Optional, but melty pockets make these truly irresistible.
• A flaky pinch of sea salt for finishing takes these over the top.

Equipment

• An air fryer (basket or oven style)
• A 6- or 7-inch round or square baking pan, or a small loaf pan that fits inside your basket
• Parchment paper
• A mixing bowl and a whisk or spoon

Pan tip: Measure the inside of your air fryer basket before you start. The pan needs to sit with at least a little room for air to circulate around it. A 6-inch cake pan or a small metal/silicone baking dish works in most models.

How to Make Air Fryer Peanut Butter Blondies

Step 1: Line your baking pan with parchment paper, leaving a little overhang on two sides so you can lift the blondies out later. Lightly grease any exposed spots.

Step 2: In a bowl, whisk together the peanut butter, brown sugar, egg, and vanilla until smooth and glossy. It will look thick and a little stiff — that’s exactly right.

Step 3: Sprinkle in the baking soda and salt and stir until fully combined. Fold in the chocolate chips.

Step 4: Scrape the batter into the lined pan and smooth the top with the back of your spoon. Press a few extra chocolate chips on top if you like.

Step 5: Set your air fryer to 320°F (160°C) and cook for 12 to 15 minutes. The top should be set and golden, and a toothpick inserted near the center should come out with a few moist crumbs — not wet batter.

Step 6: This is the step everyone wants to skip, and the step that matters most. Let the blondies cool in the pan for at least 20 to 30 minutes. They finish setting as they cool and go from gooey-mush to perfectly fudgy. Lift them out by the parchment, slice, and finish with flaky salt.

Tips for the Best Blondies

• Don’t use natural peanut butter. The oil separation in natural peanut butter throws off the ratio and can make the blondies greasy or crumbly. A standard creamy peanut butter gives you that classic chewy bite.
• Every air fryer is different. Wattage and airflow vary a lot between models, so treat the time as a guide. Check at 12 minutes the first time you make these.
• Watch the top. Air fryers blow hot air directly down, so the top can brown faster than a conventional oven. If it’s darkening too quickly, loosely tent a small piece of foil over the pan.
• Underbake slightly for fudgy, bake fully for cakey. Pull them a minute early if you love a dense, gooey center.
• Patience pays off. Warm blondies straight from the basket will fall apart. Cooled blondies slice clean.

Variations

• Crunchy: Swap in crunchy peanut butter for texture.
• Other nut butters: Almond butter or cashew butter both work beautifully; the flavor shifts but the technique stays the same.
• Salted caramel swirl: Spoon a tablespoon of caramel over the batter and swirl with a knife before air frying.
• Extra chocolate: Stir in chopped dark chocolate or a tablespoon of cocoa powder for a deeper, brownie-adjacent vibe.
• Add-ins: Chopped pretzels, toffee bits, or a handful of chopped peanuts all play well here.

Storage

Store cooled blondies in an airtight container at room temperature for up to 4 days, or in the fridge for up to a week (they get denser and even fudgier cold). They also freeze well — wrap individually and freeze for up to 3 months, then thaw at room temperature.

Frequently Asked Questions

Can I make these without an egg? Yes. A “flax egg” (1 tablespoon ground flaxseed mixed with 3 tablespoons water, rested for 5 minutes) works as a substitute, though the texture will be a touch softer.

Can I bake these in a regular oven instead? Absolutely. Bake at 350°F (175°C) for 18 to 22 minutes, or until the edges are set and the center is just barely firm.

Why did mine turn out oily? Almost always the peanut butter. Natural, oil-separated peanut butter is the usual culprit. Switch to a standard no-stir brand.

Can I double the recipe? You can, but you’ll likely need to bake in two batches since most air fryer pans are small. Don’t overcrowd the basket — air needs to circulate.

How do I know when they’re done? The top will look set and golden, and a toothpick near the center comes out with moist crumbs rather than raw batter. They’ll firm up considerably as they cool, so don’t wait for them to look fully baked through.

More Air Fryer Desserts You’ll Love

If you can’t get enough of easy air fryer treats, try these next from Fork To Spoon:

• Air Fryer Peanut Butter Cup Brownies — Rich chocolate brownies meet creamy peanut butter cups for the ultimate chocolate-and-peanut-butter mashup.
• Copycat Applebee’s Butter Pecan Blondies — Chewy blondies loaded with white chocolate and pecans, topped with a warm buttery pecan sauce.
• Air Fryer Homemade Peanut Butter — Smooth, creamy peanut butter made with air-fried peanuts and just one ingredient.