Place bacon in a large skillet and cook over medium heat until crispy. Drain on a paper towel-lined plate and crumble when cool.
Reserve 2 tablespoons bacon drippings in the same skillet. Add cabbage and onion. Cook over medium heat until cabbage is wilted and onion is translucent.
Add cabbage and onion to mashed potatoes. Stir in half of the bacon and reserve remaining baco...