Microwave potatoes for 8 minutes. Cool slightly, then cut into 1/2" slices. Set aside.
In a large skillet, fry the bacon until crispy. Remove bacon to paper towel lined plate and reserve bacon fat. Wipe pan clean.
Add 2 Tablespoons reserved bacon fat and the Brussels sprouts to the pan. Cook over medium to medium high heat until slightly charred, about 10 minutes. Remove to a large serving bowl and wipe pan clean.
Add 2 Tablespoons reserved bacon fat and the sliced potatoes to the pan and cook over medium high heat, tossing periodically, until browned, about 10-15 minutes.
Transfer to serving bowl. Crumble bacon over the potatoes, add the dressing, and toss.