First, gently melt your chocolate chips with the coconut oil (if using) in a microwave-safe bowl, heating for 30-second bursts until smooth. Stir well between each burst.
Carefully pour the melted chocolate into a clear plastic cup. Tilt and rotate the cup to create an even, thin chocolate coating on the inside walls, then pour out any extra chocolate.
Pop the chocolate-lined cup into the freezer for about 30 minutes until the chocolate is completely firm and set.
While the cup chills, brew two shots of espresso or prepare a small cup of strong coffee/cold brew.
Once the chocolate is solid, remove the cup from the freezer. Fill it generously with ice cubes.
Pour your freshly brewed coffee over the ice, followed by your milk of choice. If desired, stir in your preferred natural sweetener or sugar-free syrup now.
Secure the lid on the cup and gently squeeze the sides. Listen for that satisfying "crack!" as the chocolate shell breaks apart into delicious shards, mixing with your latte.
Enjoy your refreshing and fun summer treat immediately!