Sourdough Peanut Butter Cookies are a delicious way to use sourdough starter or discard while making a classic homemade treat. These cookies combine the rich, nutty flavor of peanut butter with the gentle tang of sourdough, creating cookies that are soft in the center, lightly crisp around the edges, and wonderfully satisfying.
If you regularly bake sourdough bread, you probably have extra starter that needs to be used. Instead of throwing it away, turn it into something sweet! Sourdough discard works beautifully in cookies because it adds flavor and moisture while helping create a tender texture.
These peanut butter cookies are easy enough for a weekday baking project but delicious enough for holidays, bake sales, lunchboxes, and family gatherings.
Why You’ll Love These Sourdough Peanut Butter Cookies
There are plenty of reasons to keep this recipe in your regular baking rotation.
First, it is an excellent way to use leftover sourdough discard. The discard gives the cookies a subtle fermented flavor that pairs especially well with peanut butter.
The cookies also have a wonderful texture. The edges become lightly golden while the centers stay soft and chewy. Peanut butter provides plenty of richness, while the sourdough contributes a pleasant depth of flavor.
Another advantage is that the dough is simple to prepare. You do not need complicated equipment or advanced sourdough skills. If you have a sourdough starter, peanut butter, and a few basic baking ingredients, you are ready to bake.
Ingredients
For the Cookies
- 1 cup creamy peanut butter
- 1/2 cup unsalted butter, softened
- 3/4 cup brown sugar
- 1/4 cup granulated sugar
- 1/2 cup sourdough discard
- 1 large egg
- 1 teaspoon vanilla extract
- 1 1/2 cups all-purpose flour
- 1/2 teaspoon baking soda
- 1/2 teaspoon salt
Optional Additions
- 1/2 cup chocolate chips
- 1/3 cup chopped peanuts
- A little flaky sea salt for topping
For the best texture, use creamy peanut butter. Natural peanut butter can also work, but make sure it has been thoroughly stirred so the oil is evenly distributed.
How to Make Sourdough Peanut Butter Cookies
Step 1: Prepare the Oven
Preheat your oven to 350°F (175°C). Line one or two baking sheets with parchment paper. This prevents the cookies from sticking and makes cleanup much easier.
Allow your butter and egg to come close to room temperature before beginning. Soft butter blends much more easily with the sugars.
Step 2: Cream the Butter and Sugars
Add the softened butter, brown sugar, and granulated sugar to a large mixing bowl.
Beat until the mixture becomes smooth and creamy. This usually takes a couple of minutes with an electric mixer, although you can also mix by hand.
Creaming the butter and sugar helps create a lighter cookie texture while evenly distributing the sugar.
Step 3: Add Peanut Butter and Wet Ingredients
Mix in the peanut butter until smooth.
Add the sourdough discard, egg, and vanilla extract. Continue mixing until everything is well combined.
The mixture may look slightly softer than traditional peanut butter cookie dough because of the sourdough discard. That is perfectly normal.
Step 4: Combine the Dry Ingredients
In a separate bowl, whisk together the all-purpose flour, baking soda, and salt.
Gradually add the dry ingredients to the peanut butter mixture. Mix just until the flour disappears.
Avoid overmixing the dough. Too much mixing can develop the gluten in the flour and make the finished cookies tougher instead of soft and tender.
If you want to add chocolate chips or chopped peanuts, gently fold them in at this stage.
Step 5: Chill the Dough
For easier handling and thicker cookies, refrigerate the dough for about 30 minutes.
Chilling is especially helpful if your kitchen is warm or your peanut butter is very soft. It allows the butter to firm up, which helps reduce excessive spreading during baking.
Step 6: Shape the Cookies
Scoop the dough into small portions and roll each portion into a ball.
Place the cookie dough balls onto the prepared baking sheet, leaving several inches between them.
For the classic peanut butter cookie appearance, gently press each dough ball with a fork to create a crisscross pattern.
You can also sprinkle a tiny amount of flaky sea salt over the tops before baking if you enjoy a sweet-and-salty flavor.
Step 7: Bake
Place the baking sheet in the preheated oven and bake for approximately 10–12 minutes, or until the edges are lightly golden.
Do not wait for the centers to look completely firm. The cookies will continue cooking slightly from the residual heat after they come out of the oven.
For soft cookies, take them out when the centers still look a little underdone.
Step 8: Cool
Allow the cookies to rest on the baking sheet for about 5 minutes.
They will be delicate immediately after baking, so giving them time to set makes them much easier to move.
Transfer the cookies to a wire rack and let them cool completely.
Tips for Perfect Sourdough Peanut Butter Cookies
Use sourdough discard with a pleasant smell. Older discard can work well, but it should not have an unpleasant or unusual odor.
Do not overmix the dough. Once the flour has been incorporated, stop mixing.
Chill when necessary. If the dough feels extremely soft, chilling will make shaping easier and help prevent excessive spreading.
Measure flour carefully. Too much flour can make peanut butter cookies dry. For the most consistent results, weighing the flour is ideal.
Watch the baking time. Cookies can go from perfectly soft to dry surprisingly quickly. Remove them once the edges are lightly golden.
Variations
Chocolate Chip Peanut Butter Cookies
Fold 1/2 cup of chocolate chips into the dough before shaping. Milk, semisweet, or dark chocolate chips all work well.
Peanut Butter Chocolate Cookies
Add chocolate chips and sprinkle the finished cookies with a small amount of flaky salt for an extra-rich flavor.
Crunchy Peanut Butter Cookies
Replace some of the creamy peanut butter with crunchy peanut butter and add chopped roasted peanuts.
Cinnamon Peanut Butter Cookies
Add 1/2 teaspoon of ground cinnamon to the dry ingredients for a warm, lightly spiced variation.
How to Store
Once completely cooled, store the cookies in an airtight container at room temperature. They should stay pleasantly soft for several days.
You can also freeze the baked cookies. Place them in a freezer-safe container with parchment paper between layers and freeze for up to several months. Thaw them at room temperature before serving.
The unbaked dough can also be portioned into individual cookie balls and frozen. When ready to bake, place the frozen dough portions on a lined baking sheet and allow a little additional baking time.
Frequently Asked Questions
Can I use active sourdough starter?
Yes. Active starter can be used, although discard is particularly convenient for this recipe because it is a great way to use excess starter.
Do I need to ferment the cookie dough overnight?
No. These cookies can be mixed, chilled, shaped, and baked the same day. The sourdough contributes flavor without requiring an extended fermentation.
Why did my cookies spread too much?
Soft butter, warm dough, warm baking sheets, or very loose peanut butter can contribute to spreading. Chilling the dough before baking can help.
Why are my cookies dry?
Overbaking is one of the most common causes of dry peanut butter cookies. Remove them when the edges are lightly golden and the centers are still slightly soft.
Can I use natural peanut butter?
Yes, but stir it thoroughly before measuring. Natural peanut butter can vary in consistency, so the dough may need slight adjustment depending on how oily or thick the peanut butter is.
Serving Ideas
Sourdough Peanut Butter Cookies are delicious with a cold glass of milk, coffee, tea, or hot chocolate. They also make a wonderful addition to cookie trays and dessert platters.
For an extra-special dessert, serve two cookies with a scoop of vanilla ice cream between them to create an easy peanut butter cookie ice cream sandwich.
Final Thoughts
Sourdough Peanut Butter Cookies are a simple and delicious way to give leftover sourdough starter a second life. With creamy peanut butter, buttery richness, brown sugar, and a subtle sourdough tang, these cookies offer a familiar favorite with a unique homemade twist.
Whether you bake them for your family, prepare them for a gathering, or simply want a delicious way to use sourdough discard, these cookies are easy, comforting, and full of peanut butter flavor. Keep a batch in your freezer so you always have a homemade treat ready whenever a cookie craving strikes.
