Preheat your oven to 400°F (200°C).
Cook the bacon in a skillet over medium heat until crispy, then crumble it and set aside.
On a lightly floured surface, roll out the puff pastry sheet to a larger size.
Arrange the thinly sliced potatoes over the puff pastry, leaving a border around the edge.
Sprinkle the shredded cheddar cheese and crumbled bacon over the potatoes.
Drizzle with olive oil, and season with salt and black pepper.
Fold the border of the pastry over the edges of the filling.
Transfer the galette onto a baking sheet lined with parchment paper.
Bake in the preheated oven for about 45 minutes, or until the pastry is golden brown and the potatoes are tender.