In a microwave-safe mug, combine the chopped pear, grated parsnip, flour, brown sugar, and cinnamon. Mix until the pear and parsnip are coated with the flour, sugar, and cinnamon.
In a small bowl, combine the walnuts, rolled oats, and melted coconut oil. Pour this over the contents of the mug.
Microwave on high for 3 to 4 minutes or until the pears are tender. Be careful taking the mug out of the microwave; you might want to use a dish towel or oven mitt. Garnish with additional walnuts, pears, brown sugar, or cinnamon. Enjoy!