If you'd like to oven fry the croquetas heat the oven to 400°F/200°C. Spread a layer of oil on the bottom of a rimmed baking tray. Transfer the croquetas to the tray and turn them to coat in the oil. Bake for 20 minutes or until the breading is golden brown and the filling is heated through. Check frequently and give the croquetas a turn at some point.