Step 1: Prepare the Oven and Baking Dish: Preheat oven to 375F (190C). Lightly grease a 9x13 inch baking dish with olive oil or cooking spray. This ensures the ingredients won't stick and makes cleanup easier.
Step 2: Saut Aromatics: Heat olive oil in a large skillet over medium heat. Add chopped onion and cook until softened, about 5 minutes. Add minced garlic and cook for another minute until fragrant. Sauting the onion and garlic first enhances their flavors, adding depth to the overall dish.
Step 3: Combine Ingredients: In the prepared baking dish, combine the rinsed brown rice, sauted onion and garlic mixture, mixed vegetables, thyme, rosemary, salt, and pepper. Stir well to distribute the seasonings evenly.
Step 4: Add Chicken and Broth: Arrange the chicken pieces evenly over the rice and vegetable mixture. Pour the chicken broth over everything, ensuring the rice is fully submerged. The broth provides the liquid needed to cook the rice and infuse the chicken with flavor.
Step 5: Bake: Cover the baking dish tightly with aluminum foil. Bake for 30 minutes. Remove the foil and continue baking for another 15 minutes, or until the rice is tender and the chicken is cooked through, reaching an internal temperature of 165F (74C). Removing the foil during the last 15 minutes allows the chicken to brown slightly.
Step 6: Rest and Serve: Let the dish rest for 5-10 minutes before serving. Garnish with lemon slices, if desired. This allows the rice to absorb any remaining liquid and the flavors to meld together, resulting in a more cohesive and flavorful dish.
Optional Tips and Substitutions: For a creamier dish, add cup of milk or cream during the last 10 minutes of baking. Chicken thighs can be substituted for chicken breasts for a richer flavor. Different vegetables, such as mushrooms or bell peppers, can be used based on personal preference.