Cook the bacon ahead of time. See the notes for directions on baking bacon.
Preheat oven to 450 degrees.
Fill a large saucepan with cold water and generous amount of salt. Add the potatoes and bring them to a gentle boil. Boil for 5-7 minutes or until potatoes are fork tender. Strain the potatoes.
Place potatoes in a mixing bowl. Drizzle 2 tablespoons of olive oil to coat potatoes.
Line a baking sheet with parchment paper. Place the potatoes on the baking sheet and use a meat mallet or mason jar to smash the potatoes to ½ inch thickness.
Season them with salt and ground pepper. Bake for 15 minutes. Remove from oven and flip potatoes with a spatula. Season the other side with saltand ground pepper. Bake an additional 15minutes. The potatoes should turn agolden brown. Remove from oven and coolpotatoes to room temperature.
Chop the celery and scallions. Cube the cheese and crumble the bacon.
Once the potatoes have cooled, add to a large mixing bowl. Add celery, scallions, cheddar, and bacon. Add the dressing to the bowl and gently mix.
Chill for a couple hours before serving. Garnish with fresh chives.