Preheat your oven to 425°F (220°C) and line a large sheet pan with parchment paper for easy cleanup.
Dice the yellow potato into 1/2-inch cubes and trim the ends off the green beans.
In a large bowl, toss the potato cubes with 0.5 tsp of olive oil and a pinch of sea salt and pepper.
Spread the potatoes onto the prepared baking sheet and roast for 10 minutes.
While the potatoes are roasting, whisk together the Dijon mustard, raw honey, garlic powder, and dried thyme in a small ramekin.
Season the chicken thighs on both sides with the remaining sea salt and black pepper.
Remove the sheet pan from the oven. Move the potatoes to one side, then place the chicken thighs and green beans on the other side.
Brush the honey-mustard glaze generously over the top of each chicken thigh.
Drizzle the remaining 0.5 tsp of olive oil over the green beans and toss them lightly on the pan.
Return the pan to the oven and roast for another 18 to 20 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are golden and crispy.