Preheat your oven to 400°F and line a baking sheet with parchment paper.
Toss the broccoli florets with half of the olive oil, half of the sea salt, and half of the black pepper, then roast for 15-20 minutes until the edges are crispy.
While the broccoli roasts, bring a small pot of water to a boil and cook the orzo according to package instructions until al dente, then drain and set aside.
Season the chicken breast with the dried oregano and the remaining salt and pepper.
Heat the remaining olive oil in a skillet over medium-high heat and sear the chicken for 5-6 minutes per side until golden and cooked through.
Remove the chicken from the pan to rest, then reduce the heat to low and add the minced garlic to the same skillet, sautéing for 30 seconds.
Deglaze the pan with the chicken broth and lemon juice, scraping up any browned bits, then whisk in the Greek yogurt until a smooth sauce forms.
Add the cooked orzo to the skillet and toss to coat in the creamy lemon sauce.
Slice the chicken into strips and serve it over the creamy orzo with the roasted broccoli on the side.