Use the double burner method to melt the chocolate, vanilla, and coconut oil together until combined. Stir frequently and ensure that the mix does not burn. You can also melt everything together in the microwave in a bowl. Heat everything for 20 seconds at a time and stir. Repeat this until everything is combined well.
Add the sea salt. Mix the chocolate mixture in a bowl with the brown rice crisps and make sure everything is well combined.
Cover an 8x8 pan with parchment paper and spread the chocolate cereal mix evenly into a pan with the spatula. Do this gently so that you do not crush the cereal!
Place in the freezer for 20 minutes or until frozen and let it stand for 15 minutes before cutting.
Cut into smaller pieces with a sharp knife once cooled and enjoy! Store in the refrigerator or the freezer. Optional: add extra sea salt on top.