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

Unwrap all the Hershey's Kisses and set aside.

In a medium bowl, whisk together the flour, baking soda, and salt until well combined.

In a large bowl, beat the butter and peanut butter together with an electric mixer for about 1-2 minutes until smooth and creamy.

Add both sugars into the mix and beat until light and fluffy, about 2-3 minutes.

Mix in the egg, vanilla extract, and milk until well combined.

Gradually add in your dry ingredients on low speed until just mixed, avoiding overmixing.

Roll the dough into 1-inch balls and coat each in granulated sugar.

Place them about 2 inches apart on the prepared sheets and bake for 8-10 minutes until the edges are set but the centers look a touch soft.

Once out of the oven, press a Hershey's Kiss into the center of each cookie, letting it crack slightly around the edges.

Let them cool on the baking sheet for about 2 minutes before transferring them to a wire rack to cool completely.