Preheat your oven to 375°F (190°C).
Cut the chicken breast into bite-sized pieces and place them in a bowl with the olive oil, garlic powder, onion powder, sea salt, and black pepper, tossing to coat thoroughly.
Steam the broccoli florets for 3-4 minutes until they are bright green and just slightly tender.
In a medium mixing bowl, combine the seasoned chicken, steamed broccoli, cooked brown rice, and Greek yogurt, stirring until the mixture is creamy and well-distributed.
Transfer the mixture into a small oven-safe baking dish, pressing it down into an even layer.
Sprinkle the shredded cheddar cheese evenly over the top of the chicken and broccoli mixture.
Bake for 20 to 25 minutes until the chicken is fully cooked through and the cheese on top is melted and starting to turn golden brown.