Optional Add-Ins

These aren't necessary, but if you want to turn these simple blondies into something extra special, try:

  • ½ cup chocolate chips
  • ½ cup peanut butter chips
  • ½ cup chopped peanuts
  • ½ teaspoon vanilla extract
  • Pinch of salt
  • A drizzle of melted chocolate
  • Flaky sea salt for the top

Of course, once you start adding extras, technically they're no longer a 3-ingredient blondie.

But I won't tell if you don't!

Tools You'll Need

Keep it simple:

  • 8x8-inch baking pan
  • Mixing bowl
  • Whisk or wooden spoon
  • Rubber spatula
  • Measuring cups
  • Parchment paper
  • Cooling rack
  • Knife for slicing

Lining the pan with parchment paper is especially helpful because you can lift the entire slab out once it has cooled.

Ingredient Tips and Substitutions

Can I Use Crunchy Peanut Butter?

Absolutely.

Crunchy peanut butter will give the blondies little pieces of peanuts throughout the batter and add extra texture.

What About Natural Peanut Butter?

It can work, but consistency matters.

Natural peanut butter often separates into oil and solids. Make sure it is thoroughly stirred before measuring, and be aware that a particularly runny variety can change the texture of the finished blondies.

Can I Use Another Nut Butter?

You can experiment with almond butter or cashew butter, although the flavor and texture will be different.

For the most reliable peanut butter blondies, stick with conventional creamy peanut butter.

Can I Use White Sugar?

You can, but brown sugar gives these blondies their characteristic deeper flavor and chewy texture.

If you substitute granulated sugar, expect a somewhat different result.

Can I Add Vanilla?

Definitely!

A teaspoon of vanilla adds another layer of flavor, although it means the recipe technically becomes a 4-ingredient blondie.

How to Make 3-Ingredient Peanut Butter Blondies

Step 1: Prepare the Oven

Preheat your oven to 350°F (175°C).

Line an 8x8-inch baking pan with parchment paper, leaving some overhang on two sides.

Lightly grease the parchment if desired.

Step 2: Combine the Ingredients

Add the peanut butter, brown sugar, and eggs to a mixing bowl.

Stir until everything is thoroughly combined and the batter looks smooth.

Don't worry if it feels thicker than a traditional cake batter.

That's exactly what you want.

Step 3: Transfer to the Pan

Scrape the batter into your prepared baking pan.

Use a spatula to spread it evenly into the corners.

The batter is thick, so take your time smoothing the surface.

Step 4: Bake

Place the pan in the preheated oven and bake for approximately 20–25 minutes.

The edges should look set, while the center should still have a little softness.

Be careful not to overbake.

That's the secret to keeping these blondies chewy rather than dry.

Step 5: Cool Completely

Remove the pan from the oven and let the blondies cool in the pan.

For the cleanest slices, allow them to cool completely before cutting.

If you can resist!

The center continues to set as the blondies cool, so cutting them while they're piping hot can make them seem softer and more fragile than they actually are.

Step 6: Slice and Serve

Use the parchment overhang to lift the blondies from the pan.

Cut into squares or rectangles and serve.

A glass of cold milk alongside these?

Absolutely perfect.

Tips for the Best Peanut Butter Blondies

Don't overbake them. This is probably the most important tip. The center should look set but still soft.

Measure the brown sugar correctly. Pack it firmly into the measuring cup for the intended sweetness and texture.

Use room-temperature eggs. They blend more easily with the peanut butter.

Line your pan with parchment. It makes removing and slicing the blondies much easier.

Let them cool before slicing. They'll firm up as they cool.

Use a sharp knife. For cleaner cuts, wipe the blade between slices.

Try a pinch of flaky salt. If you love the sweet-and-salty combination, sprinkle a tiny amount over the top before baking.

Delicious Variations

Three ingredients are all you need, but these blondies are practically begging to be customized.

Chocolate Chip Peanut Butter Blondies

Fold ½ cup of semisweet chocolate chips into the batter.

Peanut Butter and Chocolate Swirl

Drop spoonfuls of melted chocolate or chocolate spread over the batter and gently swirl with a knife.

Peanut Crunch Blondies

Add chopped roasted peanuts for extra texture.

Peanut Butter Cup Blondies

Add chocolate chips and peanut butter chips for a candy-bar-inspired treat.

Sweet and Salty Blondies

Sprinkle the finished bars with a tiny amount of flaky sea salt.

That contrast with the brown sugar is so good.

What to Serve With Peanut Butter Blondies

These little bars are wonderful all by themselves, but there are plenty of ways to turn them into a bigger dessert.

With Ice Cream

Place a warm blondie in a bowl and top it with vanilla ice cream.

Then add a drizzle of chocolate sauce.

You're welcome.

With Fresh Berries

Strawberries, raspberries, or blueberries add a fresh contrast to the rich peanut butter.

With Whipped Cream

A small spoonful of whipped cream makes these feel more like a plated dessert.

With Coffee

The nutty sweetness pairs beautifully with a cup of hot coffee.

With Milk

Classic, simple, and probably my favorite.

How to Store Peanut Butter Blondies

Once completely cooled, place the blondies in an airtight container.

They can be stored at room temperature for about 3–4 days.

For longer storage, refrigerate them for approximately 5–7 days.

Keep parchment between layers if you're stacking them.

Can You Freeze Them?

Yes!

These blondies freeze very well.

Wrap individual pieces tightly in plastic wrap or place them in a freezer-safe container with parchment between the layers.

Freeze for up to 2–3 months for best quality.

Thaw at room temperature.

You can also warm a thawed blondie briefly in the microwave if you like that soft, just-baked texture.

Make-Ahead Tips

These are excellent for making ahead.

Bake them the day before you need them, let them cool completely, and store them tightly covered.

They'll be ready whenever dessert time arrives.

They're also a great option for bake sales, lunchbox treats, potlucks, and casual gatherings because they're easy to transport and don't require frosting.

General Recipe Information

Prep time: 5 minutes
Bake time: 20–25 minutes
Cooling time: 30–60 minutes
Total time: About 1 hour
Yield: 16 blondies
Pan: 8x8-inch
Oven temperature: 350°F (175°C)
Difficulty: Easy

Frequently Asked Questions

Why are my peanut butter blondies too dry?

They were likely baked a little too long. These blondies don't need to look completely dry in the center when they come out of the oven. They'll continue setting as they cool.

Why are my blondies so soft?

The center is naturally soft and chewy, especially while warm. Allow them to cool completely before judging the final texture.

Can I double this recipe?

Yes. For a larger batch, you can double the ingredients and use a larger baking pan. Keep an eye on the baking time because the thickness of the batter will affect how quickly the blondies cook.

Can I make these blondies with crunchy peanut butter?

Yes. Crunchy peanut butter works well and adds extra peanut pieces throughout the bars.

Do these blondies need flour?

Not in this three-ingredient version. The eggs provide structure while the peanut butter and brown sugar contribute the remaining texture and richness.

Can I make them gluten-free?

The basic three ingredients are naturally gluten-free, but always check the labels of your specific peanut butter and other ingredients if you need to avoid gluten because manufacturing practices can vary.

Can I add chocolate chips?

Absolutely. Semisweet chocolate chips are one of the easiest and most delicious additions.

How do I get clean cuts?

Cool the blondies completely first. For especially neat slices, chill them briefly before cutting and use a sharp knife wiped clean between cuts.

Approximate Nutrition Information

Nutrition will vary depending on the exact peanut butter and serving size.

For 1 of 16 blondies, a rough estimate is:

  • 150–170 calories
  • 4–5 g protein
  • 18–21 g carbohydrates
  • 7–9 g fat
  • 1–2 g fiber
  • 12–15 g sugar

These figures are estimates and can change with different brands, portion sizes, and optional additions.

Final Thoughts

Sometimes you don't need a complicated dessert to make something everyone loves.

These 3-Ingredient Peanut Butter Blondies prove it.

With just peanut butter, brown sugar, and eggs, you can make soft, chewy, rich little bars that taste like a cross between a peanut butter cookie and a fudgy blondie.

They're quick enough for a last-minute craving, simple enough for beginner bakers, and delicious enough that nobody will care how short the ingredient list is.

And honestly, recipes like this are the ones I find myself coming back to again and again.

Because when the peanut butter craving hits, who wants to wait?

More Easy Peanut Butter Desserts to Try

If you're a serious peanut butter fan, don't stop with these blondies!

Try adding these to your dessert list:

  • Classic Peanut Butter Cookies
  • No-Bake Peanut Butter Balls
  • Chocolate Peanut Butter Fudge
  • Peanut Butter Oatmeal Bars
  • Peanut Butter Chocolate Chip Cookies
  • Easy Peanut Butter Pie
  • Peanut Butter Banana Bread

Did You Make These Peanut Butter Blondies?

I'd love to hear how they turned out!

Leave a review and share a photo on Pinterest so other peanut butter lovers can see your creation.

And if you added chocolate chips, chopped peanuts, flaky salt, or another delicious twist, let me know. I'm always curious to see how readers make these simple recipes their own!

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