Preheat your oven to 375°F (190°C) and line your baking sheets with parchment paper.

In a large mixing bowl, cream the peanut butter, unsalted butter, packed brown sugar, and granulated sugar until smooth and fluffy.

Add in the egg and vanilla extract, mixing until fully incorporated.

In a separate bowl, whisk together the flour, baking soda, and salt, then slowly mix into the wet ingredients.

Scoop the dough into 1-inch balls, rolling in granulated sugar if desired.

Place the cookie dough balls on the prepared baking sheets, spaced about 2 inches apart.

Bake for 8-10 minutes until puffed and lightly cracked; the bottoms should turn golden brown.

Remove from oven and press a chocolate kiss into the center of each cookie.

Let the cookies cool on the baking sheet completely.