Cook the croquettes
Preheat the oven to gas 6, 200°C, fan 180°C. Heat about 2-3 tbsp vegetable oil in a frying pan over a medium-high heat. Put half the croquettes in to the pan and cook for around 6-8 minutes, turning regularly until all sides are golden. Put on a separate baking tray and repeat with the remaining croquettes. When they are all cooked, put in the oven for 12 minutes.