In the microwave. My wife doesn't eat breakfast and usually I don't want to mess up a pan cooking on the stove top so I usually just have a bowl of cheerios but occasionally I like to have something different so I came up with this.
whip 2 eggs (I add a touch of milk)
pour egg on a microwave safe plate in micro wave (covered)
zap on high for 1 1/2 minutes
add filling and fold over (I used some sliced ham and swiss cheese)
zap for 30 seconds
add toasted English muffin