Peanut butter whirls

Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.

Cream together the butter and peanut butter in a large bowl until smooth and well combined.

Beat in the sugar and egg until the mixture is light and fluffy, then add the vanilla extract and mix well.

In a separate bowl, whisk together the flour, baking soda, and salt.

Gradually fold the dry ingredients into the peanut butter mixture, adding the milk to achieve a soft, workable dough.

Chop the chocolate bar into small pieces and fold gently into the dough.

Spoon dollops of dough onto the prepared baking sheet, spacing them about 2 inches apart, and gently swirl with a fork or knife to create the characteristic whirl pattern.

Bake for 10-12 minutes until the edges are lightly golden but the centers remain soft.

Remove from the oven and allow the whirls to cool on the baking sheet for 2-3 minutes before transferring to a wire rack to cool completely.