Garlic cloves, sliced very thin
Salt and pepper, to taste
Heat oven to 425.
Scrub potatoes. Make a series of parallel cuts in the potato that nearly go through, every 4mm or so. Shove a sliver of garlic in each cut. Smear some butter over top of the potato. Drizzle olive oil on top. Sprinkle with salt and pepper. Bake for 50-75 minutes or until cooked through (internal temp 210 F, according to Wikipedia).
This was after 45 minutes. It was not done yet.