Preheat oven to 180°C. Arrange the black beans on an oven tray and bake for 15 minutes, until the skins begin to split. Sauté the shallots and garlic in half the olive oil in a pan over a moderate heat for 5 minutes, until softened. Season with salt and pepper.
Mix the beans, shallots, chipotle, cashew butter, egg, half the panko and feta in a bowl and knead until the mix holds together. Roll in the remaining panko. Fry in the remaining oil until crisp and hot. Arrange the Leicester cheese on top to melt.
Spread the burger bun bases with cream cheese, put the lettuce, carrot sauerkraut and patties on top, then finish with the crushed crisps and aioli.