Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Halve the baby potatoes and trim the woody ends off the asparagus spears.
Toss the potatoes and asparagus with 0.5 tbsp of olive oil, sea salt, and black pepper on the prepared baking sheet.
Roast the potatoes for 10 minutes, then add the asparagus to the tray and roast for an additional 12 minutes until the vegetables are tender and golden.
While the vegetables roast, season the chicken breast with dried thyme, lemon zest, and the remaining salt and pepper.
Heat the remaining 0.5 tbsp of olive oil in a skillet over medium-high heat.
Sear the chicken for 6 to 8 minutes per side until the exterior is golden brown and the internal temperature reaches 165°F.
Add the minced garlic and lemon juice to the pan during the final minute of cooking, spooning the pan juices over the chicken to create a light glaze.
Serve the zesty chicken immediately alongside the roasted asparagus and potatoes.