Preheat your oven to 350°F (175°C) and cut the chicken breasts into bite-sized pieces.

Cook the brown rice in boiling water according to package instructions, usually about 40-45 minutes.

In a mixing bowl, combine Greek yogurt or low-fat cream of chicken soup with your preferred seasonings.

In a large casserole dish, mix together the cooked brown rice, chicken pieces, and chopped vegetables. Pour the creamy sauce over the mixture and stir until combined.

Spread the mixture evenly in the casserole dish and sprinkle mozzarella cheese on top if desired.

Bake in the preheated oven for about 40 minutes, until the top is golden and bubbly.

Remove from the oven and let cool for 10 minutes before serving.