Preheat the oven to 400 F.Heat a small skillet over medium-high heat and dry roast the panch phoron, tossing regularly to prevent burning, until very fragrant, about 3-4 minutes. Set aside and let cool completely. (Store unused blend in airtight jar; will keep for a few months.)
Place the wedges in a bowl, add the olive oil, garlic, salt and panch phoron and toss to evenly coat the potato pieces. Spread the potato pieces onto a large baking sheet. Bake for about 45 minutes or until lightly browned and crispy, turning them over with a spatula after 20 minutes and every 10 minutes thereafter. Serve immediately.