Perfect combination of chocolate with a sweet candy cane white chocolate treat on top! Layer cookies between waxed paper and store in the refrigerator for up to 5 days.
Preheat the oven to 375 degrees F (190 degrees C). Line 2 baking sheets with parchment paper.
Beat butter in a large bowl with an electric mixer for 30 seconds. Add sugar, brown sugar, and baking soda; beat until well mixed. Mix in eggs, melted chocolate, and vanilla extract. Gradually beat in flour and cocoa powder until well combined.
Drop rounded teaspoonfuls of dough 2 inches apart onto the prepared baking sheets.
Bake in the preheated oven until edges begin to firm up, about 7 minutes. Remove from the oven and add 1 white chocolate kiss to the center of each cookie, pressing down just slightly. Return to the oven and bake for approximately 1 minute. Cool on the baking sheets for 1 minute before removing to a wire rack to cool completely.