Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Trim the ends of the broccolini and toss on the baking sheet with 0.5 tbsp of olive oil, half the sea salt, and half the black pepper.
Roast the broccolini for 12-15 minutes until the florets are slightly charred and the stems are tender.
While the vegetables roast, season the chicken breast evenly on both sides with the dried rosemary, dried thyme, and the remaining salt and pepper.
Heat the remaining 0.5 tbsp of olive oil in a heavy-bottomed skillet over medium-high heat.
Place the chicken in the skillet and sear for 6-7 minutes per side, or until the internal temperature reaches 165°F and the exterior is golden brown.
In the final minute of cooking, add the minced garlic to the pan and stir constantly to prevent burning while it releases its aroma.
Remove the skillet from the heat and immediately drizzle the fresh lemon juice over the chicken to deglaze the pan.
Plate the crispy chicken alongside the roasted broccolini, spooning any remaining pan juices over the top before serving.