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

Whisk together the flour, baking soda, and salt in a medium bowl until well combined.

Cream together granulated sugar, brown sugar, unsalted butter, and peanut butter until light and fluffy. Mix in egg and vanilla until combined.

Gradually fold the dry ingredients into the wet mixture until just incorporated.

Form 1-inch balls of dough and roll them in granulated sugar. Space them 2 inches apart on the baking sheets.

Bake for about 10 minutes; press a chocolate wafer onto the center of each cookie right after removing from the oven.

Allow to cool on a wire rack completely.

Beat unsalted butter until creamy, then add confectioners’ sugar, vanilla, pinch of salt, and heavy cream until smooth.

Frost the bottom of each chocolate kiss with frosting and press onto the melted chocolate wafer cookie.