01 -
Beat the softened butter, peanut butter, granulated sugar, and brown sugar in a large bowl for 2 minutes, until creamy and lighter in color.
02 -
Beat in the egg, milk, and vanilla until smooth. Scrape the bowl so the peanut butter mixture is even.
03 -
Whisk the flour, baking soda, and salt in a separate bowl. Add to the peanut butter mixture and mix just until a soft dough forms.
04 -
Cover and chill the dough for 20 minutes. Heat the oven to 375°F and line baking sheets with parchment paper.
05 -
Scoop the dough into 1-inch balls, roll each ball in granulated sugar, and place 2 inches apart on the prepared baking sheets.
06 -
Bake for 8-10 minutes, until puffed and lightly golden at the edges. Do not wait for the centers to look firm.
07 -
Immediately press one unwrapped chocolate kiss into the center of each hot cookie. Move the cookies to a wire rack and cool completely before storing.