01 - Preheat the oven to 425°F. Line a large baking sheet with parchment paper or lightly grease it.
02 - In a large bowl, toss the potatoes with 2 tablespoons of olive oil, half the minced garlic, rosemary, thyme, salt, and pepper.
03 - Spread the potatoes on the prepared baking sheet in a single layer. Roast for 20 minutes.
04 - While potatoes roast, toss green beans with remaining olive oil and garlic.
05 - After 20 minutes, add green beans to the baking sheet, stirring them gently with the potatoes.
06 - Continue roasting for 10–12 minutes, until potatoes are golden and green beans are tender-crisp.
07 - Remove from the oven. Sprinkle with parsley (and Parmesan, if using). Toss gently and serve warm.