In a medium sized saucepan, heat olive oil. Add garlic and saute until golden brown and fragrant. Add in brown rice, black beans, sun-dried tomatos, and spices. Stir together, being careful not to mash the black beans. Put a lid on the saucepan, and let it heat together for about 5 minutes, stirring a few times. Meanwhile, saute the diced chicken breast just enough to heat it up.