Peel oranges and separate them into segments. Clean off as much of the pith (white stuff) as you can. Dry pieces with a paper towel. Line a small baking sheet with wax paper.
In a small mixing bowl combine chocolate chips, coconut oil and cinnamon. Microwave in 30 second intervals, stirring in between, until chocolate is completely melted. Stir until smooth.
Take each orange segment and dip about halfway into the chocolate. Lift orange out of the chocolate and give it a gentle shake to remove excess. Place on baking sheet.
Sprinkle tops with flaky sea salt, if desired. Repeat with all the orange pieces.
Place pan in the refrigerator for 15 minutes to allow chocolate to harden completely. Enjoy right away or move oranges to an airtight container to keep in the fridge for 2-3 days.