Buttery, nutty, and irresistibly chewy, Sourdough Peanut Butter Cookies are the kind of treat that disappears fast. And they are equally good with a glass of cold milk and a strong espresso coffee! The sourdough discard adds a subtle tang that balances the sweetness, while the sugar-coated tops crack beautifully as they bake. Grab your mixing bowl and get ready for some happy baking!
In a large mixing bowl, using an electric hand mixer, beat the softened butter until fluffy.
Add both types of sugar and beat again for 1-2 minutes, until fully incorporated.
Tip in the sourdough discard, peanut butter, egg yolk and vanilla and beat again, until combined.
In a separate bowl, mix the flour, baking soda and salt.
Gently fold dry ingredients into the wet ingredients, mixing just enough for there to be no dry pockets of flour.
Cover the bowl and place it in the fridge for 4 hours.
Preheat the oven to 170°C (340°F). Line two large baking sheets with parchment paper.
Shape 12 even sized balls of cookie dough (about 50g each). Roll each of them in a little sugar and arrange them on a baking sheet, giving them plenty of space in between.
Bake the cookies for 12-15 minutes, until the edges are golden brown but the centre looks slightly undercooked (this will give them that chewy texture we all love).
OPTIONAL, BUT RECOMMENDED: After 10 minutes, take the baking sheets out of the oven and drop them from 20cm height onto a kitchen worktop - this creates that signature cracked tops. Return them to the oven and repeat the banging after your cookies are fully cooked.
Allow the baked cookies to firm up for 10 minutes on the baking tray. Then place them on a wire rack to cool down completely.