- Preheat your oven to 350°F and gather all the ingredients. 
- Preparing everything in advance will make the process smoother and faster. 
- Combine the rice, carrots, shallot, and Dijon mustard in a mixing bowl. 
- Mix them well so that the mustard coats everything evenly. 
- Place the mixture in a greased baking dish. 
- Layer the shredded chicken on top of the rice mixture. 
- Sprinkle garlic powder, thyme, salt, and black pepper over the chicken. 
- Pour chicken broth over the chicken and rice. 
- Cover the dish tightly with aluminum foil to keep the moisture in. 
- Bake in the preheated oven for about 45 minutes until the rice is tender. 
- Remove the foil, sprinkle Gruyere and Parmesan cheese over the top. 
- Return to the oven uncovered for an additional 10-15 minutes, until the cheese is bubbly and golden.