Preheat your oven to 350°F.
In a mixer, cream together the butter and sugar.
Add the egg and vanilla. Mix until well blended.
In another bowl whisk together the flour, baking soda, and salt.
Add the flour mix, alternately with the milk, to the butter mixture, mixing until well blended.
Line a cookie sheet with parchment paper.
Shape the cookie dough into 1-inch balls.
Roll the balls in sprinkles, and place them on a cookie sheet. Do not press them down.
Bake for 8 to 10 minutes, or until edges of the cookies are lightly browned.
Remove all of the wrappers from the peppermint kisses, and set aside.
Remove the cookies from the oven and let cool for 3-4 minutes, then press a Hershey's Kiss into the middle of each cookie.
Let cool completely on a wire rack.