Oh, I’ve been there! Just put your ingredients in a jar (or other microwave-safe container), and microwave for one minute, uncovered. Then cover your container and take it with you to work. Carry the fruit or other toppings separately and stir everything together when you’re ready to enjoy. You might want to add an additional splash of milk with this method, as the cooking of the microwave seems to dry out the oats a little more than when leaving them sit overnight.