Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large mixing bowl, combine the peanut butter, sugar, egg, vanilla extract, baking soda, and salt. Mix until smooth and well combined.
Using a tablespoon or a cookie scoop, portion the dough onto the prepared baking sheet, leaving space between each cookie.
Flatten each cookie slightly with the back of a fork, creating a crisscross pattern.
Bake in the preheated oven for about 10-12 minutes until the edges are lightly golden. Remove from the oven and let them cool on the baking sheet for 5 minutes before transferring them to a wire rack.
While the cookies cool, melt the chocolate chips and coconut oil together in a microwave-safe bowl, heating in 30-second intervals and stirring in between until smooth.
Dip each cooled cookie halfway into the melted chocolate, allowing the excess to drip off. Place the dipped cookies back on the parchment-lined baking sheet.
If desired, sprinkle a pinch of coarse sea salt over the chocolate before it sets.
Allow the chocolate to harden at room temperature or refrigerate for quicker results.
Notes
Arrange the cookies neatly on a plate and drizzle with extra melted chocolate for a decorative touch.