Preheat your grill or grill pan over medium-high heat. Season the chicken breasts with salt, black pepper, and olive oil.
Grill the chicken for about 6-7 minutes on each side, or until the internal temperature reaches 165°F. Remove from the grill and let it rest for 5 minutes before slicing.
While the chicken is resting, prepare the bowls. In each bowl, add 1/2 cup of cooked brown rice as the base.
Top the rice with the sliced grilled chicken, cherry tomatoes, cucumber, and avocado.
Drizzle chimichurri sauce and garlic sauce over the top of each bowl.
Garnish with fresh cilantro and serve with lime wedges on the side.