Beat butter and sugar until well combined using an electric mixer or simply a whisk (1 minute).

Mix in vanilla extract. Then sieve in flour. Add salt and mix until it comes together into a dough. The dough should feel pliable and not sticky. If it is sticky, add a little more flour (1-2 tablespoons).

Shape the dough into a rectangle with your hands (I work with half of the dough at a time, but feel free to do the whole dough at once). Wrap it with plastic wrap then roll it with a rolling pin into a thickness of 1 cm (1/3-inch).

Melt the chocolate in a double boiler or microwave. Dip each cookie halfway into the melted chocolate. Run the cookie bottom along the inner side of the bowl edges to remove excess chocolate. Place on parchment paper then refrigerate until set.