Preheat your oven to 425°F (220°C).
In a large bowl, combine the halved baby potatoes, olive oil, minced garlic, dried thyme, dried rosemary, salt, and pepper. Toss until the potatoes are well coated.
Spread the potatoes in a single layer on a large baking sheet. Roast in the preheated oven for 25 minutes.
While the potatoes are roasting, prepare the green beans. In the same bowl, toss the trimmed green beans with a tablespoon of olive oil, salt, and pepper.
After 25 minutes, remove the baking sheet from the oven and stir the potatoes. Add the green beans to the baking sheet and return to the oven.
Roast for an additional 15-20 minutes, or until the potatoes are golden brown and the green beans are tender-crisp.
Remove from the oven and drizzle with lemon juice. Toss gently to combine.
Garnish with chopped fresh parsley before serving.