This is not hard but the slits can be a little time consuming/fiddly. Stick with it though and you may just find your new favourite way to eat potatoes.

Ingredients
2 tbsps flavourless oil 
1 bag of salad potatoes 
50g butter 
3 whole cloves of garlic, peeled and bashed  
Salt 
Pepper 

Method
Preheat the oven to 180c and put your baking tray with the oil into the oven. 

Now you need to cut your potatoes ¾ of the way through.  Now the easiest way to do that is to either put a metal skewer vertically through the potato at the bottom or to place your potatoes between the handles of 2 wooden spoons.  If you are using a skewer, put the skewer side of the potato down on your chopping board.  Very carefully slice down the potato at 3mm intervals.  Take the butter and smear over the top of the slit side of the potatoes. 

Take the hot oil out of the oven and put the potatoes in, slit side up.  Add the smashed garlic and season generously with salt and freshly ground black pepper.  Put into the oven and roast for 20 minutes. 

After 20 minutes shake the tray and move the potatoes around so they get thoroughly coated with the oil then put back into the oven for a further 20 minutes.  Repeat this process making sure that the cut side is up and roast for a further 10 minutes until super crispy and soft inside.