Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Halve the baby potatoes and mince the garlic clove.
In a small bowl, toss the halved baby potatoes with half of the olive oil and a pinch of the sea salt and black pepper.
Spread the potatoes onto the prepared sheet pan and roast for 10 minutes to give them a head start.
While potatoes roast, season the chicken breast evenly with the dried oregano, minced garlic, and the remaining sea salt and black pepper.
Remove the pan from the oven, move the potatoes to one side, and place the chicken breast, asparagus, and cherry tomatoes on the other side.
Drizzle the remaining olive oil over the asparagus and tomatoes, then squeeze the juice from the lemon half over the chicken and vegetables.
Return the pan to the oven and roast for another 15-20 minutes until the chicken reaches an internal temperature of 165°F and the potatoes are fork-tender.