Place 2 tablespoon of oil and butter in a large, heavy bottomed skillet. Place in cold oven and preheat oven to 400 degrees.
While the pan is heating up, cut potatoes into ⅛ths and toss with the remaining 1 tablespoon of oil, garlic, salt and pepper.
When the oven has come up to 400 degrees, carefully pour potatoes into the hot skillet, arranging into a single layer if possible. Cook for 30-40 minutes uncovered. Do not stir the potatoes as they cook. We want each piece to stay in one spot for as long as possible to form that nice cripsy crust. The potatoes are done when tender and deep golden brown on the side that was facing the pan.