Cook the bacon in a large non-stick skillet over medium heat
until
crisp. Remove with a slotted spoon to a paper towel; set aside.
In the same skillet, cook the onion in the bacon drippings 1
minute over
medium heat. Add the mushrooms; raise the heat to medium-high
and cook
and stir until the vegetables are tender, about 4 minutes.
Add the spinach; cook and stir just until it is wilted, about 1
minute.
Sprinkle with the reserved bacon and ground pepper.
