Add the potato, carrot, broccoli and sprouts to a saucepan. Cover with cold water and set on a medium heat, bring to the boil then lower the heat and simmer for 8-10 minutes until the vegetables are soft and mashable.
Drain well and add to a bowl. Using a potato masher, mash the vegetables into a chunky mash. The vegetables should still be chunky and not too smooth. Add the cranberries, panko, Parmesan, garlic and onion granules and mustard powder. Mix well and season with salt and pepper to taste. Leave to cool.
When the mixture has cooled enough to handle, form into 18 small croquette shapes. Add the beaten egg to a bowl and the breadcrumbs to a second bowl. Dip each croquette into the egg then into the breadcrumbs making sure to coat on all sides.
Once coated, place into your air fryer basket and spray with low calorie cooking spray. Cook at 180°C for 10-15 minutes, turning hallway through until golden brown. You may need to do this in batches. Serve 3 croquettes per person with a side of cranberry sauce or glug of gravy.