Preheat the oven to 450 degrees F (230 degrees C).
Place potatoes into a large pot and cover with salted water; bring to a boil. Reduce heat to medium-low and simmer until tender, about 10 minutes. Drain.
Meanwhile, place bacon in a large skillet and cook over medium-high heat, turning occasionally, until evenly browned, about 10 minutes. Drain bacon slices on paper towels and crumble when cool enough to handle. Reserve bacon grease.
Grease a baking sheet with a small amount of the bacon grease and place potatoes on the sheet. Smash potatoes with the bottom of a glass, then brush with more bacon grease. Repeat once more (smashing/brushing). Lightly salt potatoes.
Roast potatoes in the preheated oven until crispy, about 15 minutes. Top with blue cheese and crumbled bacon. Bake until cheese is melted, about 5 more minutes.