Ingredients for 3-Ingredient Peanut Butter Blondies
You only need three ingredients to make this easy dessert.
1. Creamy Peanut Butter – 1 Cup
Creamy peanut butter provides the main flavor and much of the fat that gives these blondies their rich texture.
For the most predictable results, use conventional creamy peanut butter that is well mixed and easy to stir. Natural peanut butter can sometimes be runnier or separate into oil and solids, which may affect the batter's consistency.
2. Packed Light Brown Sugar – 1 Cup
Brown sugar sweetens the blondies and contributes a warm, caramel-like flavor.
Be sure to pack the brown sugar into your measuring cup so you get the intended amount. Light brown sugar works beautifully here, but dark brown sugar may be used if you prefer a deeper molasses flavor.
3. One Large Egg
The egg binds the peanut butter and sugar together, helping the blondies hold their shape after baking.
For easier mixing, let the egg sit at room temperature for a short time before you begin.
That's it! Three simple ingredients are all you need.
Kitchen Tools You’ll Need
You don't need any special equipment for this recipe. Gather these basic kitchen tools before you begin:
An 8 × 8-inch baking pan
Parchment paper or a little grease for the pan
A medium mixing bowl
A sturdy spoon or spatula
Measuring cups
A toothpick, if you want to check the center
A cooling rack, optional
A sharp knife for cutting the cooled blondies
Lining your baking pan with parchment paper is especially helpful. Leave a little overhang on two sides so you can lift the blondies out easily once they have cooled.
How to Make 3-Ingredient Peanut Butter Blondies
Ready to bake? These easy peanut butter blondies come together in just a few straightforward steps.
Step 1: Preheat the Oven and Prepare the Pan
Preheat your oven to 350°F (175°C).
Line an 8 × 8-inch baking pan with parchment paper, leaving a little overhang along the sides. Alternatively, lightly grease the pan.
Preparing the pan first makes it easier to transfer the thick batter and remove the finished blondies without breaking them.
Step 2: Mix the Three Ingredients
Add the following ingredients to a medium mixing bowl:
1 cup creamy peanut butter
1 cup packed light brown sugar
1 large egg
Stir everything together until the mixture is smooth, thick, and evenly combined.
The batter will be thicker than a typical cake batter, so don't worry if it takes a little effort to mix. Scrape the sides and bottom of the bowl as you stir to make sure there are no pockets of unmixed sugar or peanut butter.
Avoid adding extra ingredients unless you're intentionally making a variation of the recipe.
Step 3: Spread the Batter in the Pan
Spoon the batter into your prepared baking pan.
Use a spatula to press it into an even layer, spreading the mixture all the way into the corners. Smooth the top so the blondies bake as evenly as possible.
Because this batter is thick, take your time with this step. An even surface helps produce a more consistent result.
Step 4: Bake Until the Edges Are Golden
Place the pan in your preheated oven and bake for 20–25 minutes.
Look for lightly golden edges and a center that appears set. The middle may still look soft when you remove the pan, but it will continue to firm up as the blondies cool.
Oven temperatures can vary, so begin checking toward the earlier end of the baking time.
Try not to overbake them. Leaving the blondies in the oven for too long can make them dry or crumbly instead of soft and chewy.
Step 5: Let the Blondies Cool Completely
Remove the pan from the oven and place it on a heat-safe surface.
Allow the blondies to cool completely in the pan before cutting them. This step is important because the mixture needs time to firm up.
If you lined the pan with parchment paper, use the overhang to lift the cooled blondies onto a cutting board.
Step 6: Cut Into Squares and Serve
Using a sharp knife, cut the blondies into 9 squares.
Serve them as they are, or add a few chocolate chips on top of each piece for an extra-special presentation.
The finished blondies are rich and sweet, so a small square can be a satisfying treat alongside coffee, tea, or a cold glass of milk.
Tips for Making the Best Peanut Butter Blondies
Even a three-ingredient recipe benefits from a few simple tricks. Keep these tips in mind for the best results.
Use Well-Mixed Peanut Butter
If your peanut butter has separated, stir it thoroughly before measuring. Too much oil at the top can make the batter greasy or inconsistent.
Conventional creamy peanut butter generally provides predictable results for this recipe.
Measure the Brown Sugar Correctly
Pack the brown sugar into the measuring cup rather than scooping it loosely.
Accurate measurements help keep the balance between the peanut butter, sugar, and egg consistent.
Spread the Batter Evenly
A thick batter can be difficult to spread, but an even layer helps the blondies bake at a similar rate throughout the pan.
Use a flexible spatula to gently press the mixture into the corners.
Watch the Baking Time
The difference between a soft blondie and an overbaked one can be just a few minutes.
Start checking at around 20 minutes. The edges should be lightly golden, and the center should appear set rather than wet.
Remember that the blondies will firm up as they cool.
Cool Before Slicing
It's tempting to cut into freshly baked blondies, especially when the kitchen smells so good!
However, cutting too early can cause the squares to crumble or fall apart. Letting them cool completely gives the texture time to settle.
Check Your Ingredients for Allergens
Peanut butter contains peanuts, a major food allergen. If you're serving these blondies to others, let them know what the recipe contains and check ingredient labels for any additional allergen information.
Easy Variations and Add-Ins
The original recipe is delicious in its simplest form, but you can make it your own with a few additions.
Keep in mind that extra ingredients may change the texture, sweetness, or baking time.
Chocolate Chip Peanut Butter Blondies
Fold a small handful of chocolate chips into the finished batter before spreading it in the pan.
Milk chocolate creates a sweeter dessert, while semisweet or dark chocolate balances the sweetness of the brown sugar.
Peanut Butter and Chocolate Swirl
For a pretty finish, gently swirl a little melted chocolate through the top of the batter before baking.
Use a toothpick or the tip of a knife to create a simple pattern. Avoid mixing too vigorously, so the swirl remains visible.
Crunchy Peanut Butter Blondies
If you enjoy a little crunch, replace the creamy peanut butter with crunchy peanut butter.
The small peanut pieces add texture to every bite. Results may vary slightly depending on the brand and consistency of the peanut butter.
Vanilla Peanut Butter Blondies
Add a small splash of vanilla extract to the batter for extra aroma and flavor.
This takes the recipe beyond its original three ingredients, but it's an easy variation if you have vanilla in the pantry.
A Pinch of Cinnamon
A small pinch of cinnamon can add a warm note that pairs nicely with peanut butter and brown sugar.
Start with a little, taste the batter only if it is safe to do so without consuming raw egg, and adjust future batches according to your preference.
What to Serve With Peanut Butter Blondies
These blondies are easy to serve on their own, but they also pair beautifully with a few simple extras.
A glass of milk: A classic pairing with the rich peanut butter flavor.
Coffee: The slight bitterness of coffee complements the sweetness of the blondies.
Tea: Serve a square with black tea, chai, or your favorite herbal blend.
Vanilla ice cream: Add a small scoop alongside a cooled blondie for an easy dessert plate.
Fresh strawberries or banana slices: Fresh fruit adds color and a refreshing contrast.
Chocolate sauce: Drizzle a little over the top when serving these as a more indulgent dessert.
For a casual gathering, arrange the squares on a platter and let everyone help themselves. Their simple appearance makes them ideal for afternoon snacks, bake sales, and relaxed family get-togethers.
How to Store Peanut Butter Blondies
Proper storage helps maintain the texture and flavor of your homemade blondies.
At Room Temperature
Once completely cooled, place the blondies in an airtight container.
For best quality, store them in a cool place and enjoy them within about 3 days. Because recipes and storage conditions can vary, refrigerate them if your kitchen is particularly warm or if you need to keep them longer.
In the Refrigerator
Store the cooled blondies in an airtight container in the refrigerator for up to about a week.
Chilling will make them firmer. If you prefer a softer texture, allow a piece to sit at room temperature briefly before serving.
In the Freezer
These blondies can also be frozen.
Wrap individual squares or separate layers with parchment paper, then place them in a freezer-safe airtight container or bag. For best quality, enjoy them within about 2 months.
Thaw the desired portion in the refrigerator or at room temperature, following safe food-handling practices.
Frequently Asked Questions
Can I really make blondies with only three ingredients?
Yes! This recipe uses creamy peanut butter, packed light brown sugar, and one large egg. Together, they form a thick batter that bakes into sweet, chewy squares without added flour or butter.
Are these peanut butter blondies flourless?
Yes. The recipe contains no added flour. However, if you're preparing food for someone with celiac disease or a wheat allergy, check the labels on all ingredients and take appropriate precautions against cross-contact.
Can I use natural peanut butter?
You can experiment with natural peanut butter, but the results may differ. Some varieties contain more separated oil or have a thinner consistency, which can affect the texture. Stir natural peanut butter very thoroughly before measuring.
Why are my blondies crumbly?
Crumbly blondies may have been overbaked, cut before cooling, or made with ingredients that differ in consistency from those used in the recipe.
For the next batch, check them toward the 20-minute mark and let them cool completely before slicing.
How do I know when the blondies are done?
The edges should be lightly golden, and the center should look set rather than wet. Baking generally takes 20–25 minutes at 350°F (175°C), but the exact time depends on your oven.
Can I double the recipe?
Yes, you can double the ingredient quantities, but you'll need a larger baking pan or multiple pans. The depth of the batter affects baking time, so don't assume a larger batch will bake in exactly the same amount of time.
For the most predictable results, bake the original recipe in an 8 × 8-inch pan.
Can I make these blondies without brown sugar?
Brown sugar contributes sweetness, moisture, and flavor, so replacing it may change the final texture. If you experiment with another sweetener, expect a different result rather than an exact substitute.
Do I need an electric mixer?
No. A medium bowl and a sturdy spoon or spatula are all you need. The batter is thick, but it can be mixed by hand until smooth.
Can I add chocolate chips?
Absolutely! Chocolate chips are a popular addition. Fold a small handful into the batter before spreading it in the pan, keeping in mind that extra ingredients can change the texture slightly.
Recipe at a Glance
Recipe: 3-Ingredient Peanut Butter Blondies
Prep time: Approximately 5 minutes
Bake time: 20–25 minutes
Cooling time: Allow enough time for the blondies to cool completely
Total time: Approximately 30 minutes or longer, depending on cooling
Yield: 9 squares
Oven temperature: 350°F (175°C)
Pan size: 8 × 8 inches
Main ingredients: Creamy peanut butter, light brown sugar, and one large egg
Approximate Nutrition Information
The following estimates are for one blondie when the recipe is cut into 9 equal squares. Actual values vary depending on the brands and exact quantities used.
Calories: Approximately 200–220
Protein: Approximately 5–6 g
Carbohydrates: Approximately 20–23 g
Fat: Approximately 11–13 g
Sugar: Approximately 17–20 g
These values are estimates, not laboratory measurements. For more accurate nutrition information, calculate the values using the specific ingredients and brands you use.
Final Thoughts: Simple Ingredients, Delicious Results
Sometimes the best homemade treats are the ones that ask the least of us.
These 3-ingredient peanut butter blondies are easy to prepare, require minimal cleanup, and deliver plenty of rich peanut butter flavor. With just one bowl and a few pantry staples, you can make a batch of sweet, chewy squares that are perfect for sharing—or keeping around for a little afternoon treat.
Remember the three essentials: mix the ingredients thoroughly, spread the batter evenly, and let the blondies cool before cutting.
That's all there is to it!
If you try this recipe, I'd love to hear how it turns out. Leave a comment with your experience, tell me whether you added chocolate chips, and share a photo of your blondies on Pinterest so other peanut butter lovers can find the recipe, too.
Happy baking!
