When I roast potatoes in an oven, I simply like to cut them in half and rub them with some olive oil and butter. Before I do this I make a criss cross pattern with a sharp knife. I try not to cut too deep, but I make sure to cut deep enough so that the pattern comes out. I usually just season it with some salt and pepper and rub it with a garlic clove cut in half. I repeat this butter/oil/season/garlic process 3 times in a duration of 1 hour. The oven is usually around 190 celsius. The end result is a great looking, tasty yet simple side dish worthy of any steak !