Add all the ingredients, apart from the toppings, to a blender or food processor. Blend until thick and creamy.
Pour the mixture into an oven-safe ramekin. Swirl the almond butter through the batter, then top with the banana slices and a sprinkle of chocolate chips and/or chopped nuts.
Bake for 18–22 minutes, or until golden and cooked through.
Finish with a drizzle of maple syrup or a dollop of yoghurt, if desired, and enjoy.
Notes
Ramekin size: approximately 12.5 cm diameter × 5.1 cm high.
For an extra touch, dust with a little cinnamon before serving.