Toss the potatoes, oil, salt, thyme, garlic powder, and pepper on a baking sheet until the potatoes are evenly coated in oil. Spread in a single layer with the cut side of the potatoes down.
2 lbs small potatoes: red or gold baby, creamer, or fingerlings, 4 tablespoon olive oil, 1 teaspoon kosher salt, ¼ teaspoon black pepper, 1 teaspoon dried thyme, ½ teaspoon garlic powder