01 -
In a medium bowl, whisk together the all-purpose flour, baking soda, and salt. Set aside.
02 -
Using a hand mixer or stand mixer with paddle attachment, blend the peanut butter, unsalted butter, granulated sugar, and light brown sugar on medium-high speed until smooth and well incorporated.
03 -
Incorporate the egg, milk, and vanilla extract, scraping down the bowl as necessary to ensure even blending.
04 -
Lower the mixer speed and gradually add the dry ingredients, mixing until a smooth dough forms.
05 -
Cover the dough tightly or transfer to a sealed food container and refrigerate for at least 1 hour.
06 -
Line two baking sheets with parchment paper or silicone mats. Adjust the oven rack to just above the center and preheat the oven to 190°C.
07 -
Portion tablespoon-sized amounts of dough, roll into 2.5 cm balls, and coat each ball in granulated sugar. Place onto prepared trays, spacing 4 cm apart.
08 -
Place trays in the oven and bake for 7–8 minutes. Remove trays from oven but keep the oven on.
09 -
Immediately press a milk chocolate kiss into the center of each cookie, pressing gently to create characteristic crackled edges.
10 -
Return trays to oven and bake for an additional 2 minutes.
11 -
Let cookies rest on baking sheets for 5–10 minutes, then transfer to a wire rack to cool completely.