I first come across Tartiflettes in my local Lidl Supermarket, where they were available a a special offer. Trying them, they tuned out to be quite nice and as I knew it was a limited offer I looked up some recipes. I soon found that a traditional tariflette is often a served as a main meal, not like the 1-person portions of the Lidl product (4 in a box). Not wanting to make a large portion, I used ramekins to make a smaller version. Below is the recipe I used, please be aware that quantities are appoximate and you will have to use your own judgement:

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Mini Tartiflettes

Servings: 2

Ingredients

2 medium floury potatoes eg Maris Piper
2 rashers smoky bacon
1 onion
125 g Reblochon cheese
125 ml double cream
25 ml dry white wine

Instructions

Boil the potatoes in a pan of water. When cooled, crush the potatoes, you can leave the skin on if you want.
Fry the bacon until crisp, remove and drain on some kitchen paper.
Add the butter to the same pan and fry the finely sliced onions until translucent.
Tartiflette recipes usually ask for generous layers of potatoes. As we are here making two small portions in Ramekins, layer the potatoes thinner in order to get a few layers into the Ramekins. First, add a layer of crushed potatoes. Next, add a thin layer of the bacon and onion mixture and top this with thinly sliced Reblochon cheese. Sprinkle with a little white wine and pour over some cream.
Add more layers to fill your Ramekin, ending up with a top layer of potatoes smothered in some cream (I ended up with just 2 layers, topped with potatoes & cream)
Cook the tartiflettes in a pre-heated oven (170°C/fan150°C/gas 3) for approx. 40 minutes.