Pour the milk into a mason jar, tighten the lid, and shake vigorously for 1 minute. Remove the lid, place the glass jar in the microwave, and heat for 30 seconds. Pour the milk into the mug, using a spoon to hold back the foam. Once the milk is emptied into the mug, spoon the froth onto the top and sprinkle the cinnamon and nutmeg over the top. Serve immediately.