Preheat oven to 350F / 180C / gas 4 and lightly oil two 8-ounce oven-safe ramekins.
Put oats, milk, banana, egg, 1 tablespoon of peanut butter, maple syrup, baking powder, and salt into a blender and blend for 30 seconds, until well combined and smooth
Discard 2 tablespoons of batter.
Pour half of the batter into the two ramekins, then top each with 1 tablespoon of jelly and 2 teaspoons peanut butter. Pour the remaining batter on top of each ramekin.
Bake in the preheated oven for about 25 minutes, or until a toothpick inserted into the oats comes out clean.
Let cool slightly and serve with desired toppings.