Preheat your oven to 400°F and line a small baking sheet with parchment paper.
Season the chicken breast evenly with 0.25 tsp sea salt, 0.125 tsp black pepper, and the dried oregano.
Place the chicken on the prepared baking sheet and roast for 20-25 minutes until the internal temperature reaches 165°F.
While the chicken is roasting, heat the olive oil in a small saucepan over medium heat.
Add the diced yellow onion and minced garlic to the pan, sautéing for 3-4 minutes until translucent and fragrant.
Stir in the dry jasmine rice and cook for 1-2 minutes to lightly toast the grains.
Pour in the chicken broth along with the remaining sea salt and black pepper; bring to a boil.
Reduce the heat to low, cover the pan with a tight-fitting lid, and simmer for 15 minutes.
Remove the rice from the heat and let it sit, covered, for 5 minutes to finish steaming.
Fluff the rice with a fork and stir in the fresh parsley, lemon zest, and lemon juice.
Slice the roasted chicken into strips and serve immediately over the warm lemon-herb pilaf.