Heat the oil in a medium sized nonstick skillet over medium heat.
Add the sliced veggie dog and cook for 2 minutes or until lightly golden brown.
Flip the veggie dog rounds, then add the sliced bell peppers. Cook for another 2 minutes or until the peppers are slightly softened.
Reduce the heat to low, then fold in the kraut, stirring for one minute or until warmed through.
Season with black pepper and serve with spicy mustard.