Gather all ingredients.
Preheat the oven to 400 degrees F (200 degrees C). Line a baking sheet with parchment paper.
Brush potato slices on both sides with butter; place them onto the prepared baking sheet.
Bake in the preheated oven until lightly browned and tender when pierced with a knife, 30 to 40 minutes, flipping slices halfway through. Sprinkle with Cheddar, crumbled bacon, and green onions. Continue baking until cheese melts, 3 to 5 more minutes.
