In a large mixing bowl, add the peanut butter, egg, vanilla and 1 cup of granulated sugar. Using a hand mixer, mix until smooth.
Using a small cookie scoop, portion the cookies and roll them into 1" balls. Roll them in the granulated sugar.
Freeze the balls for 10 minutes or refrigerate them for 30.
While the dough is cooling, unwrap the candy kisses.
When you're ready to bake, preheat oven to 350 degrees.
Line your baking pan with parchment paper or a silpat lined baking sheet.
Place the cookie dough balls on the prepared baking sheet. Do not press them down.
Bake for 10 to 12 minutes at 350 degrees.
As soon as you remove the cookies for the oven, press the unwrapped candy kisses into the middle of the baked cookie.
Allow to cool 10 minutes on the baking sheet before transferring to a rack to cool completely.