Start by dicing the onion and bell pepper into small, even pieces to ensure they cook evenly. Measure out the rice and chicken broth so everything is ready to go.
Heat 2 tablespoons of olive oil in your large skillet over medium heat. Add the diced onion and bell pepper, cooking until softened and fragrant, about 4-5 minutes. This builds the flavor base for your dish.
While the veggies cook, season the chicken breasts lightly with salt and pepper. Push the softened vegetables to the side of the skillet. Add the chicken breasts and sear for 2-3 minutes on each side until golden brown but not fully cooked through. This locks in juices and adds texture.
Remove the chicken temporarily to a plate. Stir the cup of rice into the skillet with the sautéed vegetables. Pour in the chicken broth and sprinkle the entire packet of ranch seasoning over the mixture. Stir well to combine all the flavors.
Return the chicken breasts to the skillet, arranging them on top of the rice mixture. Scatter the frozen peas and carrots evenly around the chicken.
Preheat your oven to 375°F (190°C). Transfer the skillet to the oven and bake uncovered for 30-35 minutes, or until the chicken is cooked through and the rice is tender.
Once out of the oven, sprinkle fresh chopped parsley over the top for a pop of color and freshness. Let the skillet rest for 5 minutes before serving.