Yes you can. Simply mix all the ingredients (including apple and raisins) in a microwaveable bowl with plenty of room (or porridge might boil over) and microwave (uncovered) on full power for 2 minutes. Add some plant milk and stir it in to adjust consistency and microwave for another 20 seconds to warm it up. Serve and enjoy. If you like fair bit of texture to your apple, save some and stir it in when serving.