Preheat your oven to 400°F and line a baking sheet with parchment paper.
In a small bowl, whisk together 0.5 tablespoons of olive oil, lemon juice, minced garlic, and dried oregano.
Place the chicken breast in a shallow dish, coat with the lemon-herb mixture, and let it marinate for 10 minutes.
Toss the broccoli florets with 0.5 tablespoons of olive oil and a pinch of salt, then spread them on the baking sheet.
Roast the broccoli for 15-20 minutes until the edges are slightly charred and crispy.
While the broccoli roasts, heat a grill pan or outdoor grill over medium-high heat.
Grill the chicken breast for 6-7 minutes per side, or until the internal temperature reaches 165°F.
In a non-stick skillet, heat the remaining 0.5 tablespoons of olive oil over medium heat.
Add the cauliflower rice to the skillet and sauté for 5 minutes until tender and slightly golden.
Slice the grilled chicken and serve it over the sautéed cauliflower rice with the roasted broccoli on the side.