Preheat your oven to 425F and have a 9"x13" inch baking pan ready.
Place a large frying pan on medium-high heat. Drizzle the olive oil in the pan and add the chopped onion, carrot, and bell pepper. Sprinkle in the chili powder, salt, and garlic powder into the veggies. Cook until the onions are translucent.
Add the cubed up chicken breast to the veggies in the pan. Cook until the chicken is no longer pink on the outside.
Pour the chicken broth into the 9"x13" baking dish. Sprinkle the turmeric in the broth and use a whisk to dissolve it in the liquid.
Evenly distribute the rice in bottom of the baking dish. Carefully place the chicken and veggie mixture in an even layer over the rice, while trying not to disturb the rice too much.
Cover the baking dish with foil, making sure there is a tight seal. Carefully transfer the baking dish to the preheated oven. Bake for 40 minutes.
Remove the casserole from the oven and let it rest for 5-10 minutes. Remove the foil from the dish and serve right away.