Heat a skillet (cast iron is best) over medium heat.
In the meantime, spread a generous amount of coconut oil on the outer-facing sides of your bread, then spread a generous amount of Nutella on both sides of the inner-facing slices (see photo). Arrange sliced banana on one side and fold together to make a sandwich.
Once the skillet is hot, press the sandwich down and grill until golden brown and crispy - about 2-4 minutes. Lower heat if browning too quickly. Flip and repeat on the other side. Repeat until desired crispiness is achieved.
Slice in half and serve immediately! This would be amazing with some homemade almond milk. Optional additions are listed above, though this sandwich is quite delicious on its own.
*Nutrition information is a rough estimate for 1 sandwich using ~ 3 Tablespoons Nutella and 1 Tbsp coconut oil. Stats will vary depending on kind/thickness of bread.