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 tbsp olive oil, 1 tsp kosher salt, ¼ tsp black pepper, 1 tsp dried thyme, ½ tsp garlic powder