Preheat your oven to 400°F (200°C).
Dice the Yukon Gold potato into 1/2-inch cubes and trim the ends off the green beans.
Finely mince the garlic cloves, fresh rosemary, and fresh thyme.
In a small bowl, whisk together 1 tsp of olive oil with half of the minced garlic and half of the chopped herbs.
Toss the potato cubes on a parchment-lined baking sheet with the herb-oil mixture, 0.25 tsp sea salt, and a pinch of black pepper.
Roast the potatoes for 15 minutes in the preheated oven.
Add the green beans to the baking sheet, tossing them with the potatoes and remaining herb-oil mixture, then roast for another 10 minutes until the potatoes are golden and the beans are tender.
While the vegetables finish roasting, season the steak on both sides with the remaining sea salt and black pepper.
Heat the remaining 1 tsp of olive oil in a cast-iron skillet over medium-high heat and sear the steak for 3-4 minutes per side for medium-rare.
Remove the steak from the heat and let it rest for 5 minutes before slicing against the grain and serving with the roasted vegetables.