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Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 450 degrees. Bring garlic herb butter to room temperature. Wash and dry produce.
Dice potatoes into ½-inch pieces; toss on one side of a baking sheet with half the basil oil (all for 4), salt, and pepper. (For 4, spread potatoes out across entire sheet.)
Peel garlic. Place whole cloves in the center of a small piece of foil. Drizzle with oil; season with salt and pepper. Cinch into a packet and place on same sheet.
Roast on top rack until potatoes are browned and tender and garlic is softened, 20-25 minutes. (You’ll add more to the sheet after 15 minutes.)