Peanut butter blondies are the brownie’s better adjusted cousin: a dense, chewy, butterscotch flavored bar loaded with smooth peanut butter in the dough and chopped peanuts folded through,
baked low at 325°F until the edges turn golden and the center stays irresistibly soft. One 8×8 pan, twenty five minutes, and the whole kitchen smells like the inside of a peanut butter jar.
There is no chocolate in this recipe on purpose; blondies are about brown sugar and butter and that deep caramel note, and the peanut butter just moves in and takes over beautifully.
It is ideal for lunchboxes, after school snacks, game day spreads, and anyone who believes peanut butter deserves its own dessert and not just a supporting role beside chocolate.
Recipe at a Glance
- Prep time: 15 minutes
- Bake time: 25 minutes
- Total time: about 1 hour including cooling
- Servings: 16 squares
- Difficulty: Easy
- Method: Creamed bar dough, oven baked in an 8×8 pan
Ingredients You’ll Need
- 1 cup all-purpose flour
- 1 tsp baking powder
- 1/4 tsp salt
- 7 tbsp unsalted butter softened
- 1/2 cup plus 2 tbsp smooth peanut butter
- 1/2 cup light brown sugar
- 1/3 cup granulated sugar
- 1 large egg
- 1 tsp vanilla extract
- 2/3 cup peanuts chopped
Ingredient Notes & Easy Substitutions
Peanut butter: Half a cup plus two tablespoons of smooth peanut butter goes straight into the dough. Use the classic shelf stable kind here, not the natural oily stir style; natural peanut butter separates and bakes into greasy, crumbly bars. This is a flavor foundation, not a garnish.
Seven tablespoons of butter: An odd number that earns its place: just enough butter to keep the bars tender while the peanut butter carries the richness. Softened to the dent test, same as for cookies, so it creams properly with the sugars.
Both sugars: Half a cup of light brown sugar against a third of a cup of granulated is the blondie signature. The brown sugar brings chew and butterscotch flavor; the granulated brings structure and those delicate crackly edges.
Chopped peanuts: Two thirds of a cup folded through the dough, salted or unsalted as you like. They toast in the oven and turn every square into a nutty, crunchy event. Reserve a small handful to press on top for bakery looks.
Flour, baking powder, and salt: Just one cup of flour keeps these dense and fudgy rather than cakey, and the quarter teaspoon of salt keeps the peanut butter singing instead of mumbling.
The same salt logic that makes my brown sugar cinnamon cookies taste deeper than their ingredient list.
Equipment You’ll Need
- 8×8 baking pan
- Parchment paper
- Hand mixer and a large bowl
- Medium bowl for dry ingredients
- Silicone spatula
- Sharp knife
How to Make Peanut Butter Blondies
Sift, cream, combine, fold, bake, wait, cut. The waiting is genuinely the hardest instruction in the recipe. Follow with me.
Step One: Prep the Oven and Pan
Preheat the oven to 325°F. Line an 8×8 pan with parchment paper.
You are looking for a parchment sling with overhang on two sides, which lifts the whole slab out for clean cutting later. The lower temperature is deliberate; it lets a dense bar bake through without burning the edges.
Step Two: Sift the Dry Ingredients
Sift the flour, baking powder, and salt together into a bowl and set aside.
You are looking for an aerated, even blend with no baking powder clumps. Sifting feels old fashioned and takes ninety seconds, and it is why these bars bake level instead of lumpy.
Step Three: Cream the Butters and Sugars
Beat the softened butter and peanut butter together until smooth, then add both sugars and beat until light and fluffy, about 2 minutes.
You are looking for a pale, noticeably fluffed mixture, and the two minutes is a real two minutes, not an aspirational one. This creaming builds the crackly top and the chewy interior that blondies are famous for.
Step Four: Egg, Vanilla, and Flour
Beat in the egg and vanilla until combined, then add the flour mixture and beat just until combined.
You are looking for a thick, soft dough with no dry streaks and no extra mixing beyond that. Blondie dough overbeats into tough bars quickly, so the moment the flour disappears, stop the mixer.
Step Five: Fold in the Peanuts
Fold the chopped peanuts through the dough, then spread it evenly into the prepared pan.
You are looking for nuts distributed through every corner and a level surface with the corners filled. The dough is stiff; a small offset spatula or wet fingers press it into place without drama.
Step Six: Bake Until Golden
Bake for 25 minutes, until golden.
You are looking for golden edges, a set surface, and a center that gives just slightly when pressed. A toothpick should come out with moist crumbs, not wet batter. Pull them there; blondies firm up dramatically as they cool.
Step Seven: Cool Completely and Cut
Cool the pan completely before cutting into squares.
You are looking for clean edged squares with a crackly top and a dense, chewy middle. Warm blondies smear and tear; fully cooled blondies cut like they were sold somewhere fancy. Lift the parchment sling out and use a sharp knife.
For the cleanest cuts, give the cooled pan thirty minutes in the refrigerator before slicing; the brief chill firms the edges, the knife glides, and the squares line up on a plate like they came from a bakery case.
Serving Size & Batch Scaling
An 8×8 pan cuts into 16 squares, or 9 generously oversized ones if your household has opinions. The recipe doubles cleanly into a 9×13 pan; the bake time stretches to about 30 minutes at the same 325°F.
These are the snack bar that answers every after school, road trip, and potluck table question without chocolate, which makes them the rare dessert that stands entirely on its own personality.
Making More or Less?
- 8 servings: Half of everything in a loaf pan; start checking the bake at 20 minutes.
- 16 servings: The recipe as written in the 8×8.
- 24 to 32 servings: Double into a 9×13, baked about 30 minutes. Rotate the pan halfway for even gold.
For any batch: shelf stable peanut butter, a genuine two minute creaming, gentle flour mixing, and full cooling before the knife. Those four rules bake the same blondie every time.
Nutrition Estimate Per Serving
The following is an estimated nutritional breakdown per square (1 of 16), calculated from the ingredients in this recipe. It is an estimate, not medically precise information.
- Calories: ~170
- Protein: 4g
- Carbohydrates: 16g
- Fat: 10g
- Fiber: 1g
- Sugar: 11g
- Sodium: ~120mg
Useful highlight: peanuts bring real protein and healthy fats, which makes these the dessert that actually quiets hunger instead of just teasing it.
Common Mistakes to Avoid
Using natural peanut butter. The separated oil bakes into greasy, fragile bars. Shelf stable creamy peanut butter is the reliable choice here.
Shortchanging the creaming. One minute of beating gives you dense and flat; two minutes gives you chewy with a crackly top. Time it for real.
Overbaking toward firmness. Blondies harden as they cool. If the center is fully firm in the oven, they will be dry by tonight.
Cutting warm. The single most common blondie tragedy. Full cool, sling lift, sharp knife, clean squares.
Troubleshooting Guide
My blondies turned out dry and crumbly. Why? Overbaking or too much flour. Spoon and level the flour, pull the pan at 25 minutes, and the center stays fudgy.
The middle sank after baking. What happened? Underbaking or an overbeaten egg. The center should be just set at the pull; a small dip is cosmetic and gets hidden under a drizzle anyway.
The top never got crackly. Now what? The creaming was too short. Beat the butter, peanut butter, and sugars the full two minutes and the meringue like top returns.
Can I add chocolate chips? You can, and half a cup folds in beautifully, but try them plain first. The peanut butterscotch flavor is the whole personality of a proper blondie.
Variations & Customizations
Honey peanut version: Warm a quarter cup of honey with a spoon of peanut butter and drizzle over the cooled squares. Sticky, glossy, gone.
Salted pretzel version: Fold in half a cup of crushed pretzels with the peanuts. Sweet, salty, crunchy, dangerous.
Jelly swirl version: Dollop strawberry jam over the batter and swirl before baking. The peanut butter and jelly sandwich, promoted to dessert status.
More cookie jar classics: My oatmeal raisin cookies hold down the chewy drop cookie side, and the cinnamon sugar charm of my snickerdoodle cheesecake bars covers the bar tray.
The dough and pan specs here follow the exact build at Pretty. Simple. Sweet., and the two minute creaming method at Brown Eyed Baker backs the technique above.
What to Serve With It
The classic: Cold milk, un negotiably. Peanut butter bars without milk is a missed appointment.
With ice cream: A warm square under vanilla turns snack bar into dessert course in one scoop.
For lunchboxes: These hold soft and chewy for days, making them the dependable lunch treat that survives a backpack intact.
With coffee: Roasted peanut notes and dark roast coffee bring out the best in each other, especially at three in the afternoon.
Meal Prep & Make-Ahead Instructions
Can this be made ahead? Yes; bake them a day early and the texture actually settles into peak chewiness overnight. Cut them the morning they are needed for the cleanest edges.
The dough can also be mixed, pressed into the pan, and refrigerated overnight before baking; add 3 to 4 minutes to the bake time and proceed as written. The oven to table plan works around anyone’s schedule, and the baked, fully cooled slab freezes whole too; wrap it tightly, freeze up to three months, and thaw it overnight in the refrigerator before cutting.
That is the kind of meal prep future potluck you thanks present you for, sincerely and with crumbs. Square sizes stay uniform this way as well, which matters more at a buffet table than anyone ever admits.
Storage & Leftovers
Room temperature: Airtight, the blondies stay chewy for 4 to 5 days. Peanut butter keeps them moist long past where butter only bars surrender.
Freezing: Wrap the cut squares well and freeze them for up to 3 months. Thaw at room temperature for an hour or warm them straight from the freezer.
Leftover ideas: Cube into ice cream sundaes, or split warm squares and fill with marshmallow for a fluffernutter moment. Blondies are generous team players.
Reheating Instructions
Microwave (single square): Ten seconds turns the center warm and fudgy again. Fifteen and the peanuts toast back to life; twenty is a warning label.
Oven (for a plate): 300°F for 5 minutes warms several squares evenly without drying the edges.
Straight from the fridge: Dense, chewy, and excellent. Cold peanut butter is a distinct and honorable texture of its own.
Frequently Asked Questions
Why bake at 325°F instead of 350°F? The lower temperature lets a dense, chewy bar bake through before the edges harden. It is a small change with a big texture payoff.
Can I use chunky peanut butter? Yes, and then reduce the chopped peanuts to half a cup if you like; the texture gets even nuttier and the structure holds fine.
How do I know they are done? Golden edges, a set surface that barely gives in the center, and a toothpick with moist crumbs. The pan keeps cooking gently as it cools, so trust soft.
Can I make these without nuts for allergies? The chopped peanuts can be omitted, but the peanut butter itself remains, so these are not safe for peanut allergies; for a nut free blondie, swap the peanut butter for sunflower seed butter one for one.
And that is the whole pan: brown sugar, peanut butter, a low oven, and sixteen squares of chewy gold. No chocolate, no apology, and no leftovers worth mentioning. Bake them once and the request list at your house gains a permanent new line item.