Preheat oven to 400°F on Roast Setting. (If you don't have a Roast setting on your oven, use Bake).
Place potatoes in large microwave-safe dish (or bowl); cover and microwave on HIGH for 12–15 minutes or until tender when pierced with a fork.
Line a baking sheet with foil or parchment paper.
Arrange potatoes on baking sheet in a single layer; press lightly with potato masher to make hatch-mark indents, leaving potatoes somewhat intact.
Combine oil, garlic, thyme, salt, and pepper;
Brush oil mixture evenly onto potatoes.
Bake potatoes for 20–25 minutes or until browned and crisp.
Transfer potatoes to serving platter.