There are a couple of things I have been sticking to for winter breakfasts and one is oatmeal vegetable soup. I like to take a jar of soup (preferably homemade, but store bought can work just as well) - recently I have been enjoying zucchini and pea soups - heavy on the fennel :) and mix in some oats.
This is beyond easy to make. I literally take the soup, pour it into a bowl, add some oatmeal and heat for about 3-4 minutes in the microwave. It provides for me a warming and hearty breakfast to get my day started.