Sourdough Peanut Butter Squares

These sourdough peanut butter squares are rich, fudgy, and packed with bold peanut butter flavor, perfectly balanced by a subtle sourdough tang. They're an irresistible treat that brings together creamy, nutty goodness and a soft, chewy bite in every square.

Course Dessert, Snack

Cuisine American

Keyword Sourdough Discard

Prep Time 15

Cook Time 40

Total Time 55

Servings bars

Calories 382kcal

Equipment

Square Pan (9" x 9")
Stand Mixer (with paddle attachment) (or electric hand beater)

Ingredients

Wet Ingredients

120 g Peanut Butter (see notes)
100 g Butter (softened at room temperature)
130 g White Sugar
70 g Brown Sugar
2 Eggs (mine weighed 70g each, use 3 if yours are smaller)
5 g Vanilla Paste
120 g Sourdough Starter

Dry Ingredients

120 g All Purpose Flour
3 g Baking Powder
3 g Salt
100 g Chocolate Chips (optional)

Topping

110 g Peanut Butter

Instructions

Preheat the oven to 150C. Line a 9" x 9" brownie pan with parchment paper (you can spray with cooking oil or grease with butter if you prefer).
In the bowl, beat together peanut butter and butter until creamy (I use my stand mixer with the paddle attachment).
Next, add the white sugar, brown sugar, eggs, vanilla paste and sourdough starter. Beat until lighter in color and fluffy in texture. This takes around 2 minutes using the paddle attachment on my stand mixer.
Now, on top of the wet ingredients, add the all purpose flour, baking powder, salt and chocolate chips (if you're adding). Gently fold them into the wet ingredients using a spatula until the dry ingredients are just moistened. It's really important not to over mix here.
Now, spoon the mixture into your prepared pan (it should be too thick to pour). Use your spatula to spread it out evenly across the base of the pan.
Melt the peanut butter in the microwave for 30 seconds. Stir it around so that it is fully melted and you can drizzle it. Now drizzle it over the peanut butter bar mixture in the pan. Use the end of a skewer to swirl it through the batter.
Place the sourdough peanut butter squares into the oven for 30 to 40 minutes.
The sourdough peanut butter squares are done when the top is set, the edges are starting to crisp but the middle is still gooey when you shake the pan.
Take it out of the oven and allow it to cool in the pan for around an hour before slicing.

Notes

Peanut Butter - I've tested this recipe with natural peanut butter and more processed peanut butter than contains salt and sugar. It works with either type, however, the recipe is really written for using natural peanut butter so I highly recommend using this if you can.

Nutrition