Preheat oven to 200 degrees celsius (fan-forced). Line two baking trays with baking paper.
Place the cheese into the Thermomix bowl. Grate for 5 seconds, Speed 10.
Add the mashed potato, plain flour and eggs and mix for 10 seconds, Reverse, Speed 4 (or until combined).
Add the frozen peas and salt and pepper and mix for a further 10 seconds, Reverse, Speed 4.
Dust your hands with flour and roll the mixture into ¼ cup sized balls.
Place the balls into the panko crumbs and press down to flatten slightly.
Coat both sides and place onto the prepared baking trays.
Spray with cooking oil and place into the oven for 30-40 minutes or until golden and crispy on the outside (they'll still be deliciously soft on the inside).
Turn over partway through cooking.Serve warm or cold.