In a large, high-sided skillet, over medium-high heat, cook the bacon until just shy of crisp.
Add the red onion slices and cook for an additional 2-3 minutes.
Add in the sliced cabbage, salt, and pepper. Stir well to combine.
Cover the skillet and allow the cabbage to cook down for approximately 5 minutes.
Add the fresh spinach to the skillet, cover, and allow to cook again for 2-3 minutes.
Reduce the heat to medium and add in the softened cream cheese, stirring well to combine.
Add the grated nutmeg, lemon juice, and ¼ cup of the Parmesan cheese. Stir well.
Remove from the heat and serve with additional Parmesan cheese if desired.