Layer a standard muffin tin with paper, silicone or parchment cups.
Make the 1st layer: Except for the banana slices, mix together the 1st layer ingredients, adding a few spoonfuls of water if needed for moisture. Evenly distribute in the cups, a scant 1/4 cup per cavity, pressing firmly down with your fingers or the base of a measuring cup.
Place one banana slice on top of the oat mixture in each cup.
Make the 2nd layer: To a microwave safe cup or bowl, add the chocolate and coconut oil. Add to a microwave and heat in 30-second increments, stirring in between, until mostly melted. Stir, until fully melted. Be careful not to overcook or the mixture will harden.
5. Add 1 1/2 teaspoons or so on top of each oat layer, which leaves a little for the chocolate drizzle at the end, if desired. If you aren’t adding the drizzle, go ahead and use 2 teaspoons per cavity.
Now, we’ll freeze the cups on a flat surface for about 5-10 minutes.
Make the 3rd layer: Stir together the 3rd layer ingredients, until combined. Add a scant tablespoon of this mixture overtop each cup.
Lastly, top each cup with a drizzle of chocolate and a little sprinkle of sea salt (both optional).
Return the pan to the freezer for around 30 minutes, until cups are solid. Enjoy!