French Potato and Cheese Casserole

Name: French Potato and Cheese Casserole
Cuisine: European, Mediterranean, French
Ingredients: 1 kg waxy potatoes (such as Yukon Gold); 1 large onion, thinly sliced; 200 g bacon lardons (or diced smoked bacon); 1 clove garlic, minced; 250 ml crème fraîche or heavy cream; 1 Reblochon cheese (approx. 500 g), sliced in half horizontally; 1 tbsp olive oil; Salt and black pepper to taste; Fresh parsley for garnish (optional)